Sen. John McCain (R-Ariz.) took aim at the current political environment, including apparent veiled swipes at President Trump, during a speech on Monday night. 

"We have to fight against propaganda and crackpot conspiracy theories. We have to fight isolationism, protectionism, and nativism. We have to defeat those who would worsen our divisions," McCain said at the Brigade of Midshipmen at the United States Naval Academy in Annapolis, Md. 

The Senate Armed Services Committee chairman added that "we have to remind our sons and daughters that we became the most powerful nation on earth by tearing down walls, not building them."

I believe in Americans and the American dream, but it’s time we wake up. pic.twitter.com/QmSIqP0TEs

— John McCain (@SenJohnMcCain) October 30, 2017

McCain, who is battling brain cancer, didn't directly name Trump during his speech, which was largely focused on serving the country. But his remarks mirrored some of his criticism of the administration and a strain of nationalism embodied by Trump's campaign rhetoric. 

Comparing the current state of nation to the early 1990s, which he described as "hopeful," the 81-year-old senator argued that it was "time to wake up." 

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