'Please do not touch me': U.S. Senate on security alert for Trump impeachment trial

With the impeachment trial of President Donald Trump under way, U.S. senators have polished their talking points about upholding the Constitution. Senate impeachment trials are rare and historic - the one unfolding now is only the third in the nation's history - and with them come security jitters in and around the Capitol building. A large metal detector has been erected in the Senate workspace for reporters, and the press will be herded into velvet-roped holding pens outside the Senate chamber