Trump Gives Attorney General Sweeping Power in Review of 2016 Campaign Inquiry

President Trump took extraordinary steps on Thursday to give Attorney General William P. Barr sweeping new authorities to conduct a review into how the 2016 Trump campaign’s ties to Russia were investigated, significantly escalating the administration’s efforts to place those who investigated the campaign under scrutiny.

In a directive, Mr. Trump ordered the C.I.A. and the country’s 15 other intelligence agencies to cooperate with the review and granted Mr. Barr the authority to unilaterally declassify their documents. The move — which occurred just hours after the president again declared that...