Sources close to the White House told ABC News on Wednesday that Trump has learned earlier in the day Mueller would limit his scope of questioning and wanted answers both in oral and written form.
Trump’s Twitter messages this morning saying Attorney General Jeff Sessions should stop the Mueller "rigged witch hunt" were a reaction to the news from Mueller's office, according to the report.
..This is a terrible situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further. Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to USA!
— Donald J. Trump (@realDonaldTrump) 1 августа 2018 г.
Trump has repeatedly denied any dealings with Russian officials during the 2016 presidential race. The Kremlin has also denied the allegations of meddling in the US democratic process and engaging in collusion to sway the US election.