More recently, Trump and Graham have battled over foreign policy after Graham tweeted that the administration’s decision not to retaliate militarily to Iran’s downing of an American drone “was clearly seen by the Iranian regime as a sign of weakness.”

Trump bristled, insisting, “No Lindsey, it was a sign of strength that some people just don’t understand!”

He later mocked Graham’s support for the 2003 invasion of Iraq, asking reporters “how did going into Iraq work out?”