U.S. Attorney General Jeff Sessions suggested he could resign amid an increasingly fraught relationship with President Donald Trump, ABC News reported Tuesday.

Tension between Trump and Sessions heated up after the attorney general recused himself from the investigation into alleged collusion between Russia and the Trump campaign in the 2016 election, the network reported. The president reportedly blamed Sessions' recusal for the broadening of the Russia investigation.

White House spokesman Sean Spicer declined to say if Trump had confidence in Sessions, Alabama's former junior senator and the first sitting senator to endorse Trump, during Tuesday's White House briefing.

"I said I have not had a discussion with [Trump] on the question," Spicer said. I don't, If I haven't had a discussion about a subject, I tend not to speak about it."

The New York Times also reported Tuesday that Sessions offered to resign "in recent weeks," and that former FBI Director James Comey told the attorney general that it was inappropriate for Trump to meet with him privately. Comey also reportedly warned Sessions that he did not want to be left alone with Trump after the two met privately and Trump urged Comey to drop the investigation into ex-National Security Adviser Michael Flynn.