WASHINGTON -- Osama bin Laden's spokesman and son-in-law has been captured by the United States, officials said Thursday, in what a senior congressman called a "very significant victory" in the fight against al Qaeda.

Sulaiman Abu Ghaith is expected to be in U.S. federal court in New York on Friday in an initial hearing to face terror charges, according to a law enforcement official who spoke on condition of anonymity because he was not authorized to release the information. The case marks a legal victory for the Obama administration, which has long sought to charge senior al Qaeda suspects in American federal courts instead of military tribunals at the detention centre at Guantanamo Bay.

Rep. Peter King, the former chairman of the House Homeland Security Committee, credited the CIA and FBI with catching al Qaeda propagandist Abu Ghaith in Jordan within the last week. He said the capture was confirmed to him by U.S. law enforcement officials.

A Jordanian security official confirmed that Abu Ghaith was handed over last week to U.S. law enforcement officials under both nations' extradition treaty. He declined to disclose other details and spoke on condition of anonymity because of the sensitivity of the matter.

"Definitely, one by one, we are getting the top echelons of al Qaeda," said King, a Republican. "I give the (Obama) administration credit for this: it's steady and it's unrelenting and it's very successful."

Abu Ghaith became an international name in late 2001 when he appeared on pan-Arab satellite television urging Muslims everywhere to fight the United States and warning of more attacks similar to those of Sept. 11. In one video, he was sitting with bin Laden in front of a rock face in Afghanistan. A teacher and mosque preacher in Kuwait, he was stripped of his Kuwaiti citizenship after Sept. 11, 2001.

He is identified as a major al Qaeda core official by the New America Foundation think-tank in Washington. King said Abu Ghaith was involved in the planning in the Sept. 11 attacks against the World Trade Center and Pentagon.

Tom Lynch, a research fellow at the National Defence University in Washington, described Abu Ghaith as one of a small handful of senior al Qaeda leaders "capable of getting the old band back together and postured for a round of real serious international terror."

"His capture and extradition not only allows the U.S. to hold -- and perhaps try -- a reputed al-Qaida core survivor, further tarnishing the AQ core brand, but it also points to the dangers for those few remaining al Qaeda core refugees," Lynch said.

It's likely that Abu Ghaith will face a host of terrorism-related charges and possibly murder, which could carry the death penalty, said attorney Michael Rosensaft, who was a prosecutor in the U.S. Attorney's office in Manhattan until late 2012 and is now in private practice. He predicted the case will last months, if not years, and that some of the evidence against Abu Ghaith will be a challenge for prosecutors to bring to court if it is classified.

Abu Ghaith's trial will mark one of the first prosecutions of senior al Qaeda leaders on U.S. soil. Charging foreign terror suspects in American federal courts was a top pledge by President Barack Obama shortly after he took office in 2009 -- aimed, in part, to close Guantanamo Bay, Cuba..

Since Sept. 11, 67 foreign terror suspects have been convicted in U.S. federal courts, according to watchdog group Human Rights First, which obtained the data from the Justice Department through a Freedom of Information Act request.

By comparison, of the thousands of detainees who were swept up shortly after the terror attacks and held at Guantanamo Bay, only seven were convicted by military tribunals held at the U.S. Navy base in Cuba, the watchdog group said. The vast majority have been sent back overseas, either for rehabilitation or continued detention and prosecution.

"They know this is where this case belongs," Raha Wala, Human Rights First's national security attorney, said in a statement, praising the move to prosecute Abu Ghaith in New York. "That decision underscores the confidence Americans should have in our tried-and-true system of justice and its ability to handle these complex cases."

Republicans in Congress have staunchly opposed bringing terror suspects to the United States and fought the White House to keep Guantanamo open. In a statement Thursday that did not mention Abu Ghaith, House Intelligence Chairman Mike Rogers said that al-Qaida suspects should not be prosecuted in federal courts because "we should treat enemy combatants like the enemy."

The Turkish newspaper Hurriyet reported that Abu Ghaith was caught while passing through Jordan, on his way to Kuwait, shortly after leaving Turkey.

The newspaper said that Abu Ghaith was taken into custody more than a month ago at a luxury hotel in in Ankara, the Turkish capital. But Turkish officials decided he had not committed any crime in Turkey and released him, the newspaper reported.

In Ankara, Turkish officials refused to confirm Abu Ghaith's deportation or his capture in Jordan to The Associated Press. In Amman, the Jordanian capital, a security official said he had no information on the CIA arrest in Jordan.

U.S. intelligence officials in Washington and New York refused to comment on the case.