Sen. Tom CottonTom CottonImmigration battlefield widens for Trump, GOP The RAISE Act reveals what Trump really thinks about immigrants How Trump's legal immigration cuts could be a blessing to Dreamers MORE (R-Ark.) says he'd rather see Donald TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign MORE in charge of America's military than Hillary ClintonHillary Rodham ClintonAssange meets U.S. congressman, vows to prove Russia did not leak him documents High-ranking FBI official leaves Russia probe OPINION | Steve Bannon is Trump's indispensable man — don't sacrifice him to the critics MORE.

“I think he could be commander in chief,” he told host Willie Geist on MSNBC’s “Morning Joe."

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“He’s one of our leading candidates, and, as I said, any of our candidates right now would be a better commander in chief, they’d be a more serious leader for our country than Hillary Clinton is,” he added.

“[Clinton] has not only been the architect for Barack ObamaBarack ObamaCongress needs to assert the war power against a dangerous president CNN's Don Lemon: Anyone supporting Trump ‘complicit' in racism DOJ warrant of Trump resistance site triggers alarm MORE’s foreign policy which has left the world aflame, but also shown such a casual disregard for the handling of sensitive national security secrets that I believe she’s disqualified from being commander in chief.”

Cotton said any Republican would make a better president than Clinton, the Democratic front-runner.

“There are more days ahead of us than there are behind us, so we don’t know who our nominee will be,” he said. "I know whoever that nominee is, though, will be more qualified to keep Americans safe than Hillary Clinton.

“She likes to portray herself as a safe, steady, experienced hand who’s ready to answer the 3 a.m. phone call. She got one of those once. It was called Benghazi. She slept through it. Four Americans died.”

Cotton slammed the ongoing feud between Trump and GOP presidential rival Ted CruzTed CruzThe media couldn't be more blatant in distorting Trump's words on Charlottesville Curtis wins GOP primary for House seat vacated by Jason Chaffetz Kimmel: Let’s make Trump a king so he has no power MORE over their wives, calling it a distraction from serious security issues.

“I would just say that I think Melania [Trump] and Heidi [Cruz] are both very successful, accomplished women,” he said.

“We should respect them as capable advocates for their husbands’ campaigns and leave it at that and then we can get serious. Americans want to know what their elected leaders are going to do to keep them safe.”

Cotton on Monday attended a meeting between Trump and various GOP lawmakers past and present in Washington, D.C. He has not yet endorsed a Republican presidential contender.