President Joe Biden is signaling a tougher line with the Taliban than his predecessor, with top officials warning that a planned U.S. troop withdrawal from Afghanistan in May could be delayed if the insurgents fail to live up to their promises. A flurry of statements and comments from the White House, State Department and Pentagon this week left no doubt that the Biden administration had a skeptical view of a shaky peace process launched by former President Donald Trump and the Taliban's willingness to sever ties with Al Qaeda and other extremists. | 