ANALYSIS — It took 35 days, but President Donald Trump ultimately caved to Democratic demands that he reopen the government before they’d entertain negotiations on border security. And in 21 more, Trump will have to decide whether to give in again, because he’s not likely to get what he wants. Trump agreed Friday to back a three-week continuing resolution that will reopen the government through Feb. 15. But he is not giving up on his quest to secure funding for wall along the southern border. “We really have no choice but to build a powerful wall or steel barrier,” Trump...