WASHINGTON — President Barack Obama said he had "a great conversation" with Senate Republicans on Thursday, the third stop in his ice-breaking tour of the Capitol this week on the budget and other contentious topics.

The 90-minute meeting with GOP rivals, senators said, featured exchanges on the budget, the proposed Keystone XL oil pipeline, tax reform and the regulatory burden on businesses.

"He was very candid. He certainly understands that you can't fix the country without adjusting entitlements to fit the demographics of our country," said Minority Leader Mitch McConnell, R-Ky., referring to benefit programs like Social Security and Medicare. "We'll see where we go from here, but it was a great meeting."

Obama then walked across the Capitol to meet with his House Democratic allies, capping visits this week to the Democratic and GOP conferences of both House and Senate.

Thursday's meetings came as a key Senate panel moved toward party-line approval of a fiscal blueprint that would only modestly trim the budget deficit while protecting safety net programs from slashing cuts proposed by Republicans.

The Senate budget plan, drafted by Sen. Patty Murray, D-Wash., blends about $1 trillion in modest cuts to health care providers, the Pentagon, domestic agencies and interest payments on the debt with an equal amount in new revenue claimed by ending some tax breaks.

But because Democrats want to restore $1.2 trillion in automatic spending cuts over the same period — cuts imposed by Washington's failure to strike a broader budget pact — Murray's blueprint increases spending slightly when compared with current policies. And after realistic assumptions about war spending are factored in, Murray's proposal would curb the deficit by only a few hundred billion dollars over 10 years. Murray's plan allocates just $50 billion for overseas military operations next year and assumes no war spending whatsoever starting in 2016.

In the House, Budget Committee Republicans approved a 2014 budget plan late Wednesday with an entirely opposite approach. It whacks spending by $4.6 trillion over the coming decade and promises sweeping cuts to Medicaid and domestic agencies while setting a path to balancing the government's books within 10 years. The party-line vote sent the measure to the full House for a vote next week.

The partisan activity in the rival Budget panels contrasts with Obama's charm offensive, which is aimed at exploring the possibility of bipartisan agreement over politically challenging budget issues that have long gridlocked Washington.

Obama is signaling a willingness to adopt some modest steps on Medicare and Social Security, even as many of his Democratic allies wince at the idea. He told House Democrats that he could support a less generous inflation adjustment for Social Security but only as part of a larger budget bargain that includes new taxes.

He told senators to expect a decision on the keystone pipeline sometime this year though he didn't signal whether to expect his administration to approve it, said Sen. John Hoeven, R-N.D.

"This will be hard, and it will have to go against his own party to some extent as will some of us on the other side, but that we need to fix the debt for the country," said Sen. Lamar Alexander, R-Tenn. "He was candid and open and direct and he didn't sugar coat it. He recognizes that we have some pretty big differences and we ought to keep expectations under control, but he said he believes — and I think all of us believe — this is the way we should be doing business together."

Separately, debate continues in the Senate on a bipartisan spending measure wrapping up unfinished work on this year's budget — the annual spending bills funding the day-to-day operating budgets of federal agencies. Leaders hope to finish that measure, which is required to prevent a government shutdown at the end of the month, on Thursday. Hopes were fading, however.

Senate passage would send the measure, with numerous changes, back to the House, which initially approved it last week.

The debate in the Senate Budget Committee is the first time since 2009 that Democrats in charge of the Senate have advanced a budget blueprint, which opened to predictably poor reviews from the panel's Republicans, who said it was heavy on tax increases and light on cuts to rapidly growing benefit and safety-net programs.

"Is it really possible that after four years, the majority has failed to identify any reforms? That all we have is just a tax-and-spend budget that makes no alteration to our dangerous debt course?" said the top Senate Budget Committee Republican, Sen. Jeff Sessions of Alabama. "Does the majority believe the government is perfect and requires no reform?"

At issue is the arcane and partisan congressional budget process, which calls for a unique, nonbinding measure called a budget resolution. When the process works as designed — which is rarely — budget resolutions have the potential to stake out parameters for follow-up legislation specifying spending and rewriting the complex U.S. tax code.

The House budget plan embraces tough new spending levels required under the unpopular, across-the-board spending cuts that began to take effect this month. But in order to protect the Pentagon, Republicans cut even more deeply into the day-to-day operating budgets of domestic agencies next year, slashing them from the $506 billion projected under the 2011 debt and budget pact to $414 billion — an unprecedented 18 percent cut.

Murray's budget, meanwhile, not only preserves the spending caps set in the hard-fought 2011 deal but proposes $100 billion in stimulus spending for road and bridge construction, school repairs and worker training.