The Senate confirmed John Ratcliffe on Thursday to serve as the director of the C.I.A., installing him atop the spy agency that he has pledged to make more aggressive.
The vote was 74 to 25, and several Democrats joined all Republicans present in confirming him.
The support Mr. Ratcliffe received from Democrats reflects the evolution of American politics. During the first Trump administration, Mr. Ratcliffe received no support from Democrats, and his qualifications were questioned, when he was nominated to be the director of national intelligence.
But five years later, views of Mr. Ratcliffe have shifted. Unlike some of President Trump’s picks for other cabinet posts, Mr. Ratcliffe is considered to be well qualified for his position. His views on national security issues hew closely to those of the Senate Republican majority.
Senate Republicans had hoped to confirm Mr. Ratcliffe and several other nominees earlier in the week. But Democrats, expressing reservations about some picks, have slowed the push after the Senate quickly confirmed Marco Rubio to be secretary of state on a 99-to-0 vote on Monday.
As director of national intelligence in 2020, Mr. Ratcliffe declassified material on Russian election interference despite concerns from Democrats who believed that the release would endanger sources and methods. And at least two Democrats raised questions about those decisions in his confirmation hearing.
Republican allies of Mr. Trump had sought the material, believing that it undermined the case that Russia had tried to interfere in the 2016 election on behalf of Mr. Trump.