President Trump on Thursday hosted pharmaceutical executives at the White House as part of his "Made in America" campaign, during which he jumped in to help demonstrate a new piece of technology.

In the demonstration, Trump was encouraged by Wendell Weeks, an executive from Corning Inc., the manufacturers of the shatterproof glass, to test the strength of the glass by trying to break it.

"This time, don't be afraid to lean into it a little," Weeks said to laughter.

Trump obliged, straining and putting pressure on the machine in an attempt to break the glass.

"Go on...really? It's not a test of manhood," Weeks joked. "Whoa!"

"That's pretty strong," Trump replied, smiling, to applause.

Trump was hosting executives from Merck, Pfizer, and Corning, three companies that are joining together in an initiative to manufacture glass like the substance Trump tested for pharmaceutical companies in the United States. The companies were invited as part of the White House's "Made in America" campaign, a three-week long effort to highlight American-made products and jobs.

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In prepared remarks during the event, Trump said the glass manufactured by the companies would solve the "tremendous" problem of "vial-breaking" for doctors and patients.

"It’s also great for the healthcare workers who can administer the drugs — makes it much, much safer for them and safely without having any problems and worrying about vial-breaking, which, as I understand, is a tremendous problem that we’re not going to have anymore," Trump said according to an official White House transcript.

"This technology is not only great for American jobs and manufacturing, it’s great for patients who now will have access to safer medicines and vaccines."

Next week, the campaign continues with "American Heroes" week, which will be followed by "American Dream" week, according to a White House official.

The campaign is part of the White House initiative to promote "theme weeks" on specific policy areas, such as "infrastructure week" in the first week of June, during which the president tweeted about once a day on infrastructure issues. Subsequent theme weeks focused on energy and technology.