Key Trump administration officials urged Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE not to resign this summer amid increased tensions with President Trump, according to NBC News.

Vice President Mike Pence Michael (Mike) Richard PenceEx-Pence aide: Trump spent 45 minutes of task force meeting 'going off on Tucker Carlson' instead of talking coronavirus Trump asked Chamber of Commerce to reconsider Democratic endorsements: report Controversial CDC guidelines were written by HHS officials, not scientists: report MORE, along with Trump's then-Homeland Security Chief John Kelly John Francis KellyMORE and Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE worked to reassure Tillerson, sources told the network.

Pence reportedly asked Tillerson to remain at least until the end of the year.

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Tensions reportedly came to a head in late July after Trump delivered a highly controversial speech to the Boy Scouts of America, which was once led by Tillerson.

The secretary of State also referred to the president as a "moron" a few days earlier during a meeting with key Cabinet officials, according to NBC.

State Department spokesman R.C. Hammond disputed the report, telling the network that Tillerson never called Trump a "moron," and never considered quitting this summer.

This would not be the first time Trump and Tillerson appeared to have clashed.

When asked to comment about Trump's remarks on the racially charged violence in Charlottesville, Va., in August, the secretary of State told Fox News's Chris Wallace that the president "speaks for himself."

Trump in a series of tweets on Sunday also appeared to jab at Tillerson for looking to engage in direct talks with his North Korean counterparts.

I told Rex Tillerson, our wonderful Secretary of State, that he is wasting his time trying to negotiate with Little Rocket Man... — Donald J. Trump (@realDonaldTrump) October 1, 2017