The special counsel in the Russia probe is investigating a period of time last summer when President Donald Trump seemed determined to push Attorney General Jeff Sessions to resign, the Washington Post reported on Wednesday.

Special Counsel Robert Mueller is looking into whether Trump's apparent effort to drive Sessions from his job was part of a pattern of attempted obstruction of justice, the Post said, citing people familiar with the matter.

Mueller's team, which is investigating alleged Russian meddling in the 2016 U.S. presidential election, has questioned witnesses about Trump's private comments in late July and early August, around the time he issued a series of tweets belittling Sessions, according to the Post.