Sen. Tom CottonTom CottonOnly Congress can enable drone technology to reach its full potential Senate Dem offers patent reform bill Sasse: Someone subscribed me to Nickleback emails as a prank MORE (R-Ark.) says he'd rather see Donald TrumpDonald TrumpWhy Americans should be bitter over Trump’s sweetened Mexican sugar deal Dems push leaders to talk less about Russia Kobach fined over Trump meeting memo MORE in charge of America's military than Hillary ClintonHillary Rodham ClintonTrump notes 'election meddling by Russia' in tweet criticizing Obama Former Obama advisor calls Fox ‘state sanctioned media’ Biden rips Senate GOP healthcare bill, says it 'isn't about healthcare' MORE.

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

“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 ObamaFormer Obama intelligence official: Russian hack ‘the political equivalent of 9/11’ Trump notes 'election meddling by Russia' in tweet criticizing Obama Trump slams Obama for doing 'nothing' about Russia before the election 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 CruzTrump maintains healthcare push heading into weekend Trump called Cruz to press him on ObamaCare repeal bill: report US gas exports not the elixir to European energy security 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.