Corker told The Washington Post
in an interview last week that Trump's public statements on foreign policy undercut his Secretary of State -- creating "binary" scenarios for the United States on the world stage.
"You cannot publicly castrate your own secretary of state without giving yourself that binary choice," Corker told The Washington Post's Jackson Diehl in a phone interview on Friday. "The tweets -- yes, you raise tension in the region (and) it's very irresponsible."
Corker added that the Trump administration has made some progress on North Korea especially when it comes to working with China, which he credited to Tillerson's diplomatic efforts.
"The greatest diplomatic activities we have are with China, and the most important, and they have come a long, long way," Corker said, according to the Post. "Some of the things we are talking about are phenomenal."
Corker's comments follow commotion over the President's tweets aimed at the Tennessee Republican and Tillerson.
Corker, who has announced he is not going to seek re-election after 2018, and Trump have publicly quarreled
recently on social media.
"The Failing @nytimes set Liddle' Bob Corker up by recording his conversation," Trump tweeted on Tuesday. "Was made to sound a fool, and that's what I am dealing with!"
A transcript of the conversation, however, shows that the newspaper did not set Corker up and that the senator was well aware that he was on the record.
And recently, Trump said on Twitter that his secretary of state was wasting his time with diplomatic efforts in North Korea.
"I told Rex Tillerson, our wonderful Secretary of State, that he is wasting his time trying to negotiate with Little Rocket Man..." Trump said
He continued, "...Save your energy Rex, we'll do what has to be done!"
During his Sunday interview on CNN, Tillerson maintained that he's fully committed to the President's objectives, and said he wouldn't dignify
confirming or denying reports indicating that he called the President a "moron" following a meeting at the Pentagon.
"How he wants to use his own skills tactically to make change," Tillerson said, adding: "I'm there to help him achieve that."