(CNN)Donald Trump will ask Americans Monday to trust him on his new Afghanistan strategy, exercising a president's most somber duty, a decision on waging war, at a time when his own political standing is deeply compromised.
Trump will make his first prime-time broadcast on a specific policy issue to the nation as president at 9 p.m. ET to unveil his new plan, and a potential escalation of the nation's longest war, after a lengthy period of deliberations that carved deep splits within his administration.
The speech will test the President's capacity to convince Americans that he has settled on the right course of action on a major national security issue, and to unify the nation around it, despite his own depleted approval ratings and behavior that has alienated many voters in his first seven months in office.

Trump's first major national security address will also begin to show whether the credibility that the President has squandered, with his provocative rhetoric and frequent resort to falsehoods, will hamper his capacity to lead.
Monday's address, from Fort Myer, in Arlington, Virginia, represents a chance for Trump to leverage the symbolism of his office to stabilize a presidency that has threatened to spin out of control over the last two weeks.
Everything is going great! in 1 amazing Trump administration picture
Everything is going great! in 1 amazing Trump administration picture
Defense Secretary James Mattis said Sunday that Trump's policy review on the war and the entire US approach to South Asia -- i.e. Washington's tortured relationship with Pakistan and complaints that Islamabad is tacitly encouraging extremists -- had been finalized.
"He wants to be the one to announce it to the American people," Mattis said. "He now needs the weekend to collect his thoughts on how he's going to explain it to the American people."
While Trump will be unveiling a crucial national security decision, it will be impossible to divorce his speech from its political context. His inflammatory news conference last week in which he equated white supremacists and counterprotestors who clashed in Charlottesville, Virginia, triggered a stampede away from the President by senior Republican lawmakers, corporate CEOs and others that left him more isolated that ever before. His remarks also hit his own bottom line -- a long list of charities has now canceled plans to host events at his Florida resort at Mar-a-Lago.
RELATED: Here are the Republicans denouncing Trump by name
Former Director of National Intelligence James Clapper, who is now a CNN national security analyst, said that after off-the-cuff moments like the Trump Tower press conference, attention will be focused on how the President presents his case -- as well as the content of his new strategy.
"There is a lot of pressure on him and hopefully we will see the teleprompter President Trump tonight," Clapper said on CNN's "New Day," arguing that the presidency had been "seriously, seriously, wounded" by the President's remarks at Trump Tower last week.
The decision on Afghanistan also sets up a test for Trump with his own political base in the wake of the departure of his senior strategist, Steve Bannon, who opposed sending more troops to the war and was the closest link to the isolationist, populist beliefs of the President's core supporters.
Trump's long-awaited Afghanistan strategy
Trump repeatedly questioned the purpose of America's continued involvement in Afghanistan during his campaign, but he also contradicted himself on whether the war should have been fought.
Officials say that the President remains deeply skeptical about the notion of a continued presence in Afghanistan but is concerned that if the US comes home, it will leave a vacuum that could be exploited by terror groups.
But his doubts about escalating the war come up against the determination of hawkish generals in his inner circle, including national security adviser H.R. McMaster, not to give up on a war that has demanded more than a decade-and-a-half of painful American sacrifice.
As Trump mulls Afghanistan, a former general and fallen Marine's father at his side
As Trump mulls Afghanistan, a former general and fallen Marine's father at his side
Trump delegated authority to adjust troop levels to Mattis early in his administration, but he has been presented by the Pentagon with a range of options for the path forward, including a complete troop withdrawal and the deployment of up to 4,000 more soldiers to add to the more than 8,000 American forces that are already there.
Hopes that the US could finally leave Afghanistan have been checked by the Kabul government's struggle to preserve order under a resurgent challenge from the Taliban and inroads made by extremist groups like al-Qaeda and ISIS.
In June, Mattis gave a blunt assessment on the state of the war in a hearing for the Senate Armed Services Committee.
"We are not winning in Afghanistan right now. And we will correct this as soon as possible," he said.
Trump's appearance Monday night follows the most polarizing chapter of a presidency that has continually exacerbated political divisions.
His handling of the aftermath of violence at a white supremacist rally in Charlottesville earlier this month has sparked outrage and accusations that Trump has irrevocably tarnished the moral authority of his presidency.
RELATED: Republican senators are striking back in Trump's public war of words
A measure of the damage that his conduct has inflicted on his political fortunes is reflected in the continued ramifications of his news conference days afterward. A flood of CEOs distanced themselves from Trump, forcing the closure of several White House advisory councils. Some senior Republicans, including Sen. Bob Corker of Tennessee, publicly questioned his fitness for office. And few senior GOP figures have been willing to publicly defend Trump, raising new questions about his capacity to enact his agenda in Congress.
Speech, then rally
Should Trump succeed in staking out a more conventional presidential posture Monday night, any political gain could be short-lived, as he is scheduled to hold a major political rally in Arizona on Tuesday night.
A vintage, pyrotechnical performance by Trump could revive the issue of his temperament following the Charlottesville drama and further anger Americans who are already disgusted by the President's antics.
Trump, national security team head for Camp David
Trump, national security team head for Camp David
The rally offers Trump an early chance to show that despite the departure of Bannon, he remains committed to the issues and the political style that has won him steadfastly loyal support from his political base.
The issues likely to please a fervently pro-Trump crowd in Arizona are those that proved most effective for Trump in his campaign -- including on illegal immigration and the need for a border wall -- but which also cause the most alarm outside his core supporters.
In many ways, the Charlottesville episode has offered a reminder of why Trump was so controversial -- by tearing at the societal and racial divisions in American life -- but also why he was elected, since it shows how he connects with the often unspoken political instincts of a sizable slice of the country.
But in two crucial days for his administration Monday and Tuesday, Trump has to navigate two sides of his position -- the duty to rally a nation behind a foreign war and a political imperative to solidify support among his most enthusiastic voters. It is not clear that either aim is compatible with the other.

CNN's Kevin Liptak contributed to this report.

Oh dear, this is so what I didn't want to hear and exactly what I feared. The only question it seemed then was WHICH country Trump would target next to declare war on :( We knew it would happen.. all these cries that Obama et al were war mongers.. we all knew Trump was the biggest war monger ever.. and his big fat mouth was bound to get you guys into another war soon :(  

No he won't win... what tells us this is the disastrous track record...  So calling another war won't change that.. it will only squander many more lives, (on both sides) and a lot more money America can ill afford. It sure as heck won't help your country become great again - any money that could have been put into business development and support, and infrastructure will be diverted away to the latest in a long line of ILL ADVISED wars.. 

Very sad news... 

I am not a religious person, well not conventionally so, but i think I will get praying that the UK doesn't repeat its thoroughly stupid act of following America into the latest war. 

Five key pieces of Trump's Afghanistan plan

I don't expect anybody could "WIN" in Afghanistan.
The issue in that country goes back before WW1.

I heard on a couple radio interviews that "The President can't tell the American people why it's so complicated ..."
********.
I would cheer any President who spent their "address the nation" time telling us that an issue isn't as simple as everyone says, and gives a history of why it's so complicated.  I think many Americans would be surprised how little they know of the world and the motives of the people who's lives we are "playing with" in the name of "foreign policy".

This post was edited by my2cents at August 23, 2017 8:16 AM MDT

Nothing to do with Trump. No-one ever wins in Afghanistan. Not the Brits, nor the Russians, nor the US. I think China has had the sense to keep out of it. 

From what I read in the newspapers this morning Trump wanted to withdraw but his Generals talked him out of it.  He seems to be listening to his Generals which normally he should, but in this case I think they're wrong.

I expect the terrorists there to die and not be in control of the government... And that is a win.
I expect the Afghanis to step up and do their part or we leave...and that is a win.
I expect Pakistan to quit harboring terrorists or they can expect to loose the billion of dollars we give them...that is a win. This post was edited by my2cents at August 22, 2017 2:54 PM MDT