It is time for President Obama to abandon his hopes of reaching a grand budget bargain with Republicans.

At every opportunity since they took over the House in 2011, Republicans have made it clear that they have no interest in reaching a compromise with the White House. For two years, they held sham negotiations with Democrats that only dragged down the economy with cuts; this year, they are refusing even to sit down at the table.

Mr. Obama hasn’t given up inviting the Republicans to join him in making the hard choices of governing, but he has been rebuffed each time. This year, in hopes of getting some support for modest tax increases on the rich, he even proposed a reduction in the cost-of-living increases for Social Security recipients. The events of the last few weeks should make it clear to him why that offer should be pulled from the table immediately. Consider:

¶Shortly after Mr. Obama presented this idea to Republicans, more than a half-dozen of them began trashing it as too “draconian” and a “shocking attack on seniors.” For years, the party has demanded entitlement cuts, but the moment the president actually offered one, he was attacked. Then last Tuesday, Paul Ryan, the House Budget Committee chairman, said that no grand bargain is possible because Democrats aren’t willing to make significant cuts to spending and entitlement programs. The Social Security cost-of-living change, he said, did not go far enough.

¶Senate and House Republicans are refusing to meet with Democrats to negotiate over the budgets passed by each chamber. Four times in the last two weeks, Senate leaders have proposed beginning a conference committee to hash out a federal budget; four times they have been blocked by Republicans. The Senate minority leader, Mitch McConnell, and Senator Ted Cruz of Texas said they were afraid the committee might reach an agreement to raise both taxes on the rich and the debt ceiling, which are, of course, the Democrats’ stated goals. Knowing that their positions would be deeply unpopular among the public if their stubbornness were exposed in an open committee, Republicans would simply prefer not to talk at all.