Since 9/11, the Bush White House has moved aggressively to expand presidential power in wartime, at the expense of Congress. Until recently, the Republican-controlled Congress went along.

Even bipartisan concern that Samuel Alito would too enthusiastically support broad presidential powers was not enough to block his confirmation to the Supreme Court Tuesday.

But that deference may be ending. The Senate, especially, is gearing up to make the case that power between the executive and legislative branches is unbalanced.

Next week, the Senate begins the first hearings on the president's authorization of eavesdropping without a warrant.

At the same time, Republicans are divided over whether to extend 16 provisions of the USA Patriot Act that are set to expire this Friday. Four Senate Republicans are joining most Democrats to demand more protections for civil liberties.

"The presidency, whoever is in it, has real advantages in the struggle, but we may see that the Congress finally believes that the Bush administration has gone too far," says John Samples, director of the Center for Representative Government at the CATO Institute, a libertarian think tank.

For Sen. Arlen Specter (R) of Pennsylvania, who chairs the Judiciary panel, the two issues of NSA wiretaps and renewal of the Patriot Act are forever linked in time. The first reports of illegal domestic eavesdropping by the National Security Administration (NSA), published in The New York Times on Dec. 16, just before a key vote on the Patriot Act, "hit me like a cannonball between the eyes," he says.

He is asking Attorney General Alberto Gonzales to prepare for a full day of questioning on Feb. 6. Senator Specter wants to hear Mr. Gonzales explain why the Bush administration did not ask Congress to expand executive powers under the Foreign Intelligence Surveillance Act (FISA), if they were not adequate to protect the country.

"Was it because you thought you couldn't get such an expansion?" the chairman asked Gonzales in a Jan. 24 letter.

Congress, Specter wrote, was "predisposed" to grant the executive additional powers necessary to keep the nation safe. Why, then, not ask for them, or at least use the 72-hour "after-the-fact" authorization provided in the 1978 FISA? he asked.

The issue is looming so large that the White House devoted a full week in the run-up to this week's State of the Union Address to defuse the issue. Instead of "domestic spying" - the term used most often in the press - the White House described the program as "terrorist surveillance." Recent communication from Osama bin Laden and his Al Qaeda deputy, Ayman al-Zawahiri, appeared to reinforce the threat.

"The political outcome of this battle will depend on who succeeds in defining the terms of the debate," says Thomas Mann, a senior fellow at the Brookings Institution.

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