Mitch McConnell warns that Republicans won't back down from vow to force Democrats to raise debt ceiling alone: 'Do you guys think I'm bluffing?'

Senate Majority Leader Mitch McConnell.
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McConnell appears more determined than ever to resist efforts to raise the debt ceiling with Democrats.
"It's hard being in the majority. [Democrats] are the ones who will raise the debt limit," he told Punchbowl News.
It threatens to deepen a perilous showdown between Democrats and Republicans that could derail the economic recovery.
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Senate Minority Leader Mitch Mc