If Attorney General William Barr is worried about being held in contempt of Congress, he didn’t show it Wednesday.At an event outside the West Front of the Capitol honouring slain law enforcement officers, Barr approached House Speaker Nancy Pelosi, who last week joked about locking up members of the Trump administration in “a jail down in the basement of the Capitol.”According to a person who witnessed the exchange, Mr Barr shook Ms Pelosi’s hand and said loudly, “Madam Speaker, did you bring your handcuffs?”Ms Pelosi smiled and responded that the House sergeant at arms was present should it be necessary to arrest anyone, the person said, adding that Mr Barr “chuckled and walked away.”A Justice Department spokeswoman did not immediately respond to a request for comment.The exchange comes amid escalating tensions between the Trump administration and Democratic lawmakers over investigations on issues including Russian election interference, the president’s financial records and his fina...