Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on Wednesday hammered Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE as “unstable” and “trigger-happy” as he offered a plan to revitalize America’s military and sought to portray himself as a steady hand.

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Trump said his Democratic rival failed her audition to serve as president, slamming her tenure as secretary of State.

“Hillary Clinton's legacy in Iraq, Libya and Syria has produced only turmoil, suffering and death," Trump said in Philadelphia.

"It seemed like there wasn't a country in the Middle East that Hillary Clinton didn't want to invade, intervene in, or topple. She's trigger-happy and very unstable. Whether we like it or not, that's what's going on."

The GOP presidential nominee also chided Clinton for the revelations last week that she told the FBI she could not remember certain details during the agency's investigation into her use of a private email setup for State business.

"If she can't remember such crucial events and information, honestly, she's totally unfit to be our commander in chief," Trump said.

"But I have a feeling she did remember and she does know, and that makes her unfit."

Trump also offered a plan to revitalize America’s military by building up troop levels and eliminating caps on the military budget created by sequestration.

“I will ask Congress to fully eliminate the defense sequester and will submit a new budget to rebuild our military as soon as I assume office,” he said.

The sequestration measures that went into effect in 2013 as part of a budget deal affect both military and nonmilitary spending. It's unclear whether Trump believes the cuts to nonmilitary spending should remain.

Clinton has come out against all of the sequester, framing its spending restrictions as arbitrary.

But Trump hasn’t always disapproved of sequestration. He brushed aside the doom-and-gloom over the military budget cuts as “being over-exaggerated” in a 2013 interview with Fox News.

With that new military spending, Trump plans to expand every branch of the armed services, putting hard numbers to the broader pronouncements he’s made at rallies in recent weeks.

That means an Army of about 540,000 troops, a Marine Corps of about 36 battalions, a Navy with about 350 surface ships and submarines, and an Air Force of 1,200 fighter planes.

Those numbers rely on recommendations by the Army chief of staff, the conservative Heritage Foundation, and the National Defense Panel, the campaign said.

Trump will also call on his generals to draw up a plan to defeat the Islamic State in Iraq and Syria within his first month in office.

“This will require a military warfare, but also cyber warfare, financial warfare, and ideological warfare,” he said Wednesday.

"Instead of an apology tour, which you saw President Obama give over and over again, I will proudly promote our system of government and way of life as the best in the world, just like we did in our campaign against communism during the Cold War."

The GOP nominee and his opponent are both focusing on military and veterans. They will participate Wednesday evening in NBC’s "Commander-in-Chief Forum," which will focus on military-related issues.

Trump is attacking Clinton as "trigger-happy" as she and her Democratic allies continue to assert that his temperament could lead to a nuclear war. Clinton has also recently rolled out several high-profile GOP national security figures who crossed over to back her for president.

On Tuesday, the pro-Clinton super-PAC Priorities USA released a video ad that meshed Trump’s declaration of “I love war” with images of battle and a nuclear mushroom cloud.

Updated at 12:32 p.m.