Senior White House Correspondent Selina Wang reports on President Trump facing questions about upholding the Constitution; Correspondent Alex Presha has the latest on the dozens of people rescued after a yacht sinks off the coast of Miami; Correspondent Morgan Norwood reports on the multiple arrests in Brazil where police say they disrupted a plot targeting a Lady Gaga concert; and more on ABC World News Tonight.

Mary Bruce has details on Pres. Trump's Oval Office meeting with newly-elected Canadian PM Mark Carney, who won office after campaigning against Trump's tariffs and told the president today that Canada is "not for sale"; in an ABC News exclusive, Pierre Thomas reports on the urgent FBI warning about the online network ‘764' that authorities say targets children on social media and gaming platforms and extorts them into sending violent and sexual content; ahead of the secretive conclave to elect the next pope, David Muir shares new images from inside the Vatican and reports on how this year's will be like no other; and more on tonight's broadcast of World News Tonight with David Muir.