Sen. Chuck Grassley (R-Iowa), the Senate’s president pro tempore and chairman of the powerful Judiciary Committee, said he was “offended” and “disappointed” by the tirade President Trump unleashed against him on social media over the obscure Senate tradition of respecting blue-slip objections to nominees tapped to serve as district court judges and U.S. attorneys.

“Last night I was surprised to see President Trump on Truth Social go after me and Senate Republicans over what we call the blue slip,” Grassley said in a statement to open a Judiciary Committee hearing on nominations.

“I was offended by what the president said, and I’m disappointed it would result in personal........

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