President Trump took aim at Republican Sen. Bob Corker Sunday morning via Twitter, saying he lacked the "guts" to seek re-election after begging for an endorsement. This came a few days after Corker said he wouldn't support Trump's tax plan if it increased the deficit and said Secretaries Mattis and Tillerson, along with John Kelly, are helping to keep the U.S. from "chaos."

Corker then fired back: "It's a shame the White House has become an adult day care center. Someone obviously missed their shift this morning."