Sen. John McCain (R-AZ) told The Guardian in an interview on Sunday that he preferred former President Obama's leadership on the global stage to that of President Trump.
When asked if U.S. global standing was better under Obama, McCain replied, "As far as American leadership is concerned, yes."
McCain's comments came after he was asked about Trump's criticism of London Mayor Sadiq Khan following terror attacks earlier this month at London Bridge and Borough Market. Trump used the attacks to defend his controversial travel ban, which is currently held up in U.S. courts.
McCain was "visibly irked" when asked what message Trump's comments sent to the U.K., a steadfast U.S. ally, according to The Guardian.
"What do you think the message is?" McCain asked. "The message is that America doesn't want to lead."
The rest of the world is "not sure of American leadership, whether it be in Siberia or whether it be in Antarctica," McCain added.
Arizona's other Republican senator, Jeff Flake, said Trump's usage of social media is detrimental to U.S. foreign relations.
"I've said it a number of times -- it'd be easier if Trump wasn't tweeting so much," said Flake, a member of the Senate's foreign relations committee. "In terms of foreign policy, this is going to have serious consequences."