Trump and Republicans Seek to Turn the Tables in Post-Mueller Washington

President Trump and his Republican allies went on the offensive on Monday, vowing to pursue and even punish those responsible for the Russia investigation now that the special counsel has wrapped up without implicating him or his campaign in a criminal conspiracy to influence the 2016 election.

Mr. Trump, grim faced and simmering with anger, denounced adversaries who have pounded him for two years over Russian election interference, calling them “treasonous” people who are guilty of “evil” deeds and should be investigated themselves. “Those people will certainly be looked at,”...