President Donald Trump is set to deliver a stark message to America's biggest defense contractors on Wednesday: build weapons faster.Speaking to top military leaders, defense executives and investors, Trump will urge the industry to dramatically ramp up production as the wars in Ukraine and the Middle East drain U.S. weapons stockpiles and expose cracks in the nation's defense supply chain.Trump will headline a roundtable at the conclusion of the two-day Defense and Innovation Summit at the U.S. Army War College in Pennsylvania. Hosted by Republican Sen. Dave McCormick, the gathering has brought together senior Pentagon officials, military commanders, defense companies, technology firms and investors to find ways to speed up the production of advanced weapons. Trump is also expected to announce new Pennsylvania-based defense investments.President Donald Trump is expected to urge top defense executives on ​Wednesday to accelerate weapons production and expand manufacturing capacity (Reuters)The summit comes as growing global conflicts pile pressure on the U.S. military's ability to quickly replenish missiles, interceptors, and other critical munitions to meet demand.Joint Chiefs Chairman Gen. Dan Caine delivered a blunt message to industry leaders on Tuesday."What I need you to know, and I know this is simple for me to say, but hard to do, is to go faster. Please go faster. Think bolder," Caine said, stressing that the military needs industry to move at the pace of modern warfare.Smoke rises from an explosion following a drone strike on a warehouse in Al Shuaiba, Kuwait, in this still image obtained from social media video released July 14 (Social media)For Trump, expanding defense manufacturing is also part of a broader push to rebuild American industry. The administration sees Pentagon spending as a powerful engine for new factories, advanced manufacturing and stronger domestic supply chains.The president has been personally pressing defense companies to increase output. In late June, he met munitions manufacturers at the White House to demand faster production.The U.S. has shipped billions of dollars in weapons to allies while also consuming large quantities of precision-guided munitions in its own military operations, fueling concerns that inventories of some of the nation's most important weapons are being stretched.Lockheed Martin is among the nation's biggest defense contractors (Reuters)The surge in demand for rocket motors, missile components and other critical equipment is also reshaping the defense industry. Startups backed by Silicon Valley investors are increasingly challenging traditional contractors by promising faster, cheaper production, while established manufacturers including Northrop Grumman and L3Harris are investing in technologies such as 3D printing and advanced manufacturing techniques to boost output.Michael Duffey, the Pentagon's top procurement official, said the Defense Department is using long-term contracts to encourage companies to invest billions in expanding production capacity.He said roughly $20 billion in private investment has already been tied to plans to increase production of Patriot missiles and other high-demand weapons."The global environment now demands that we produce at this scale, at this speed, at this volume," Duffey said.