WASHINGTON – Republicans lack the votes to block witnesses at President Donald Trump's impeachment trial, Senate Majority Leader Mitch McConnell conceded late Tuesday, a potentially major hurdle for Trump's hopes to end the trial with a quick acquittal. Earlier, Trump's lawyers concluded his defense with a plea to move on. Even after sitting through days and late nights of argument, several Republicans apparently are ready to join Democrats in considering in-person testimony from former National Security Adviser John Bolton and perhaps others. Trump's lawyers made their closing case for a speedy acquittal Tuesday, but to no avail. McConnell told colleagues in a private meeting that he did not yet have the votes to block Democrats from summoning witnesses.