Republican presidential nominee Donald Trump opened a new front in his war with House Speaker Paul Ryan, accusing the nation's top elected Republican of being a "very weak and ineffective leader" after Ryan said he would no longer defend the presidential nominee.
"Our very weak and ineffective leader, Paul Ryan, had a bad conference call where his members went wild at his disloyalty," Trump tweeted, referring to a Monday conference call where some House conservatives challenged Ryan over Trump.
He followed that up with a tweet signaling he may take on Republican Party leaders directly while escalating attacks on Democratic nominee Hillary Clinton as he tries to salvage his embattled campaign: "It is so nice that the shackles have been taken off me and I can now fight for America the way I want to."
"Disloyal R's are far more difficult than Crooked Hillary. They come at you from all sides. They don't know how to win - I will teach them!" he tweeted later Tuesday.
The exchange intensified divisions within the party four weeks before Election Day as the Republican nominee tumbles in the polls and Ryan shifted his focus to preserving GOP majorities in the House and Senate.
Trump's tweets came a day after Ryan effectively disavowed him without formally pulling his endorsement -- and a poll showed Trump trailing Clinton by double digits ahead of November's election.
A 2005 video that surfaced Friday of Trump bragging about groping women prompted a wave of Republican lawmakers to withdraw their support in a last-ditch effort to save their control of Congress. Others, including Republican National Committee Chairman Reince Priebus and vice-presidential nominee Mike Pence, are standing by Trump.
Trump tweeted Tuesday that a lack of support from Ryan has made it "hard to do well," in an apparent acknowledgment of the political damage of increasing GOP infighting.