WASHINGTON — House of Representatives Speaker John Boehner said on Friday congressional leaders and President Barack Obama must try to move on from Republicans' failed tax plan and work together to avert the looming US “fiscal cliff.” Boehner, the top Republican in Congress, was unrepentant at a Capitol Hill news conference the day after the stunning failure of his “Plan B” option, a development that raised doubts about his own leadership and left negotiations in disarray. The failure cast fresh uncertainty over talks to avoid roughly $600 billion in across-the-board tax hikes and automatic government spending cuts due to begin in January that could push the US economy back into recession in 2013. This combination of tax hikes and spending cuts is known as the “fiscal cliff.” It was “not the outcome I wanted,” Boehner said after he was unable to muster enough Republican support in the House for a plan that would have limited income-tax increases to only the wealthiest sliver of the population - those earning $1 million and more. Boehner, Obama's chief negotiating partner in talks seeking a bipartisan “fiscal cliff” solution, said he was not concerned that Thursday's withdrawn vote threatened his position as House speaker. He did not outline a clear path forward on negotiations. The speaker failed to control unruly conservative fellow House Republicans who adamantly oppose raising taxes on anyone. They delivered a stinging rebuke to Boehner by refusing to back his “Plan B” approach. Boehner said a divided Washington must come together to revamp the massive US tax code in a way that helps spur economic growth. “How we get there, God only knows,” he said. Stocks dropped sharply at the open of trading, one day after Boehner's bill was put on the shelf. Investors have been increasingly optimistic that a deal would be worked out before the end of the year, but this has changed that equation. Major indexes lost more than 1 percent, though stocks are still higher for the week, suggesting investors still hold out hope that an agreement will be brokered in Washington. Boehner had hoped to use the Plan B option to pressure Obama in “fiscal cliff” talks. But late on Thursday he abruptly pulled the legislation. House members, heading to their home states for the holidays, were instructed to be available on 48 hours notice if necessary. “They went from Plan B to plan see-you-later,” Obama adviser David Axelrod said on MSNBC on Friday morning. Obama said he still plans to work with Congress and was hopeful for a bipartisan solution, his press secretary said in a statement late on Thursday. The House is controlled by Republicans and the Senate by Obama's fellow Democrats. The crumbling of Boehner's plan highlights his struggle to lead some House Republicans who flatly reject any deal that would increase taxes on anyone. Republican Representative Tim Huelskamp criticized Boehner's handling of the negotiations, saying the speaker had “caved” to Obama opening the door to tax hikes. Huelskamp, a dissident first-term congressman, said he was not willing to compromise on taxes even if they are coupled with cuts to government spending sought by conservatives. Conservatives “are so frustrated that the leader in the House right now, the speaker, has been talking about tax increases. That's all he's been talking about,” Huelskamp said on MSNBC on Friday morning. — Reuters