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By David Nakamura Washington Post

WASHINGTON - President Obama, his second-term agenda bogged down amid political controversies and partisan gridlock, moved Tuesday to bolster support for a sweeping overhaul of immigration laws, saying Congress "needs to act and the moment is now."

Obama's speech in the East Room of the White House marked his most forceful remarks on the issue in weeks and came shortly before the Senate voted 84-15 to bring a comprehensive immigration bill to the floor for debate. Though all 55 Democrats and a majority of Republicans supported moving the bill forward, the legislation faces a far-from-certain path in the Senate, which is likely to vote in early July.

After months of allowing a bipartisan group of eight senators to take the lead on drafting the bill, Obama sought to reassert his position at a time when conservative Republicans have begun mounting a forceful opposition.

The president said the 867-page bill is a compromise in which neither Democrats nor Republicans would get ­everything they want. But he emphasized that the United States is a "nation of immigrants" and said the estimated 11 million people who are in the country illegally deserve a clear chance to become ­citizens.

"If you genuinely believe we should fix our broken immigration system, there's no good reason to stand in the way of this bill," Obama said, flanked by a coalition of business, religious and political leaders. "If you're serious about actually fixing the ­system, then this is the vehicle to do it."

By re-entering the debate this week, the president is trying to exert his influence while not upsetting the delicate balance of the bipartisan group that negotiated the deal, aides said.

Obama has made the immigration overhaul one of his top second-term priorities, but his administration played mostly a supportive role as the Senate group negotiated the legislation. White House aides have said the president recognizes that being too far in front on immigration could risk scaring off Republicans fearful of being tied too closely to him.

But with the floor debate opening in the Senate, Obama's return to the spotlight comes at an important moment. GOP critics of the bill have begun championing a series of amendments to ­further strengthen border security, which immigration advocates fear would slow or even block the path to ­citizenship.

Meanwhile, outside organizations on both sides have stepped up their lobbying campaigns. The Heritage Foundation, a conservative think tank, announced ­Tuesday that it has started a $100,000 online campaign in opposition to the bill. The Service Employees International Union, which supports the bill, announced a seven-figure campaign featuring commercials on national cable ­channels.

Pressure on the House

Senate proponents have said they hope to win up to 70 votes to pressure the GOP-controlled House to accept the major components of the bill. Advocates also said they were encouraged by Obama's return to the issue after months of focusing on gun control, the budget and foreign policy.

In his speech, the president highlighted a broad swath of support for the bill, appearing with AFL-CIO President Richard Trumka, U.S. Chamber of Commerce President Thomas Donohue, former Commerce Secretary Carlos Gutierrez, business executive Steve Case, San Antonio Mayor Julian Castro and ­others.

"Now we're in another phase. He needs to twist some arms, including some in his own party," said Kevin Appleby, director of migration policy at the U.S. Conference of Catholic Bishops, which supports the bill. "He set down some markers. He pushed back a bit on the pending amendments. He made a case for the bill."

Critics pushed back quickly as the Senate began debate. Sen. Ted Cruz, R-Texas, said that while he expected the legislation to pass the Senate, it would fail in the House unless proponents agreed to additional border security measures and backed off a guaranteed path to citizenship for illegal immigrants.

"The path to citizenship is the single most divisive issue," Cruz said. "It's an issue that the Obama White House and Senate Democrats are insisting on, and by insisting on that I believe they have designed a bill that is destined to be voted down."

Over the next several weeks, senators on both sides of the aisle are expected to offer dozens of amendments. Senate Minority Leader Mitch McConnell, R-Ky., said the bill has "serious flaws" but supported allowing it to go to the floor. McConnell was one of several leading Republicans who said they would not support the legislation unless additional border security provisions were added.