Donald Trump spends Christmas Eve railing against impeachment

* President claims Democrats ‘in real doubt’ about evidence* Trump tells troops he has yet to buy a present for MelaniaDonald Trump has launched fresh attacks on the congressional architects of his impeachment, even as the standoff intensified between Democrats in the US House and Republicans in the Senate over the president’s impending trial, and appeared set to last well into the new year.And on a less grave note, Trump revealed in a video conference with US troops to deliver