President Trump's week started in triumph when he took out a pair of Republican adversaries up for reelection — but it's ending in a rare moment of Republican resistance, largely of his own making. Why it matters: Trump has spent the better part of a decade steamrolling congressional Republicans, but the costs of his revenge campaign — and some politically toxic priorities — have caught up with him. Driving the news: Just as the Senate was getting ready to take up a reconciliation bill Thursday to fund immigration enforcement, Senate Majority Leader John Thune (R-S.D.) suddenly decided he would send the chamber home until June. The move spared Republicans from having to vote on Trump's $1.8 billion "anti-weaponization fund" to compensate people his administration says were targeted by the Biden Justice Department. Republicans also might have been forced to vote on security funding for Trump's White House ballroom.…