It was bitterly cold as Donald Trump sat down to dinner on Jan. 5 at Camp David, the presidential retreat in Maryland’s Catoctin Mountains. Republican leaders and Administration officials had joined him for what needed to be a frank conversation. Mitch McConnell, the Senate majority leader, sat to Trump’s left; Paul Ryan, the House Speaker, to his right. The group had planned to take stock of their first year in power and hash out strategies for the next. But try as they might, Ryan and McConnell struggled to get the President to focus.