President Barack Obama sent his deputy national security adviser, Denis McDonough, on Sunday to a Washington-area mosque known for its cooperation with the FBI and its rejection of the al-Qaida brand of Islam.

"Being religious is never un-American. Being religious is quintessentially American," McDonough said.

The speech came just four days before the congressional hearing, which has already given rise to protests on grounds it is unfairly targeting Muslims. In New York’s Times Square on Sunday, about 300 people gathered to speak out against the planned congressional hearing, criticizing it as xenophobic and saying that singling out Muslims, rather than extremists, is unfair and divides the nation.

Speaking to an interfaith forum of Muslims, Christians, Jews and other faiths, McDonough, the president’s point-man on countering violent extremism, was clear: "We’re all Americans."

The majority of the recent terror plots and attempts against the U.S. have involved people espousing a radical and violent view of Islam, making it difficult to ignore the role religion plays in this particular threat. But focusing too closely on Islam and the religious motives of these attempted terror attacks also threatens to alienate an entire community that has nothing to do with these violent beliefs.

New York Republican Peter King, chairman of the House Homeland Security Committee that is holding the hearings, thinks the Muslim community can and should do more to help law enforcement thwart these attacks.

"I don’t believe there is sufficient cooperation" by American Muslims with law enforcement, King said Sunday on CNN. "Certainly my dealings with the police in New York and FBI and others say they do not believe they get the same — they do not give the level of cooperation that they need."

Two of the witnesses scheduled to testify Thursday are relatives of men who were radicalized and turned to terrorism. One is the uncle of a Somali man from Minneapolis — Burhan Hassan — who left the country in December 2008 to join a terror group in Somalia. The family believes Hassan was killed and buried in Somalia.

Another witness is the father of Carlos Bledsoe, who prosecutors say shot and killed a soldier at a military recruiting center in Arkansas in 2009. Bledsoe grew up in the Memphis, Tenn., area, converted to Muslim and changed his name to Abdulhakim Muhammad.

McDonough said Muslim Americans are not the problem, but part of the solution.

"No community can be expected to meet a challenge as complex as this alone," McDonough said. "No one community can be expected to become experts in terrorist organizations, how they are evolving, how they are using new tools and technology to reach our young people."

The Muslim community has been integral in tipping off law enforcement in many of the plots uncovered over the past two years. In 2009, the Muslim community came forward when they learned five Northern Virginia men had traveled to Pakistan with the hopes of joining a terrorist organization.

McDonough said agencies throughout the Obama administration would continue working to understand the process of radicalization. He also promised further outreach to Islamic communities in the United States, as well as efforts to dispel "misperceptions about our fellow Americans who are Muslim."

King’s critics, including the first Muslim elected to Congress, Minnesota Democrat Keith Ellison, say it is wrong to single out a religion.

"We’re concerned about the breadth of this," Ellison said on CNN Sunday. "To say we’re going to investigate … a religious minority, and a particular one, I think is the wrong course of action to take."