Cruz backs former UN Ambassador John Bolton to replace Flynn

Sen. Ted CruzRafael (Ted) Edward CruzViral video shows O’Rourke air-drumming to the Who’s ‘Baba O’Riley’ after Cruz debate Five takeaways from Cruz, O'Rourke's fiery first debate NY Times, McCabe give Trump perfect cover to fire Rosenstein, Sessions MORE (R-Texas) on Friday threw his support behind former United Nations Ambassador John Bolton to replace Michael Flynn as President Trump's national security adviser.

"He's someone who understands the world. He understands the threats of radical Islamic terrorism," Cruz told CNN's Manu Raju. "He understands the threats of an over-aggressive [Russian President Vladimir] Putin."

"And at the same, I think he has demonstrated an understanding that we should be reluctant to use military force. That we should do so only when absolutely necessary."

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Bolton, a foreign policy hawk who served as President George W. Bush's ambassador to the U.N., has also been a rumored pick for deputy secretary of State. 

Despite Cruz's approval, some Senate Republicans, such as Sen. Rand PaulRandal (Rand) Howard PaulConservatives left frustrated as Congress passes big spending bills Senate approves 4B spending bill Some employees' personal data revealed in State Department email breach: report MORE (R-Ky.), have fiercely opposed Bolton's appointment to the Trump administration.

Further complicating an appointment, Bolton was a staunch supporter of the U.S. invasion of Iraq in 2003. Trump has criticized the war after initially supporting the invasion, calling into question whether their perspectives will align.

Flynn abruptly resigned on Monday amid revelations that he may have mislead Vice President Pence about a phone call Flynn had with the Russian ambassador.

The president offered the job to retired Vice Adm. Robert Harward after Flynn's resignation, but Harward turned down the offer.