Signal President Meredith Whittaker defended the messaging app's security on Wednesday after top Trump administration officials mistakenly included a journalist in an encrypted chatroom they used to discuss a looming US attack on Yemen's Houthis.
Sen. Markwayne Mullin, R-Okla., faced an explosive confirmation hearing for Homeland Security chief as tensions flared with Sen. Rand Paul, R-Ky., over past violence comments....