Trump Demands Inquiry Into Whether Justice Dept. ‘Infiltrated or Surveilled’ His Campaign

“Now that the Witch Hunt has given up on Russia and is looking at the rest of the World, they should easily be able to take it into the Mid-Term Elections where they can put some hurt on the Republican Party,” Mr. Trump said. “Don’t worry about Dems FISA Abuse, missing Emails or Fraudulent Dossier!”

Mr. Trump was alluding to his contention that a Foreign Intelligence Surveillance Court warrant that was granted to look at Mr. Page, one of his campaign associates, was improperly obtained and based on false information provided by his political opponents, including a dossier that included salacious information about him.

Under pressure from Mr. Trump and his Republican allies in Congress, the Justice Department said in March that it would begin an investigation into the surveillance of Mr. Page. Law enforcement officials had long had concerns that Mr. Page, a former investment banker based in Moscow, was acting as a Russian agent.

But the president has continued to make the allegation that the court-ordered surveillance of Mr. Page was unjustified. Mr. Trump has also continued to claim that the special counsel should be looking not at his campaign, but instead at his 2016 rival, Hillary Clinton.

“At what point does this soon to be $20,000,000 Witch Hunt, composed of 13 Angry and Heavily Conflicted Democrats and two people who have worked for Obama for 8 years, STOP!” Mr. Trump wrote in a pair of tweets. “They have found no Collussion with Russia, No Obstruction, but they aren’t looking at the corruption in the Hillary Clinton Campaign where she deleted 33,000 Emails, got $145,000,000 while Secretary of State, paid McCabes wife $700,000 (and got off the FBI hook along with Terry M) and so much more.”

It was not clear where Mr. Trump’s estimate of the cost of Mr. Mueller’s inquiry came from. The Justice Department reported at the end of last year that the special counsel’s investigation had incurred at least $6.7 million in expenses in its first four and a half months, and Mr. Trump’s own budget allocated $10 million for his office for 2019.

The president has often charged that Mr. Mueller is leading a team of Democratic activists who are out to get him, citing reports that some of his investigators are Democrats who supported Mrs. Clinton. He has also sought to discredit Andrew G. McCabe, the former deputy F.B.I. director, by noting that his wife ran as a Democrat for political office in Virginia with support and campaign donations from Terry McAuliffe, a close Clinton ally.