Rather than shutting Guantanamo, the U.S. military is gearing up for the war-crimes trial of a former child soldier at the navy base on southeastern Cuba this summer.

The case of detainee Omar Khadr highlights how President Barack Obama has struggled to carry out a pledge he made immediately after taking office to close the globally unpopular military prison, which he called a recruiting tool for terrorists.

But if some trials are to proceed without delay, there is no other viable location, thanks to congressional opposition to moving terror detainees to U.S. soil, plus the time required to buy and renovate an Illinois prison _ the one place where they would be welcome.

"The prosecutors in Khadr's case have informed us that if the trial takes place in July 2010, it will be held at Guantanamo," said Army Maj. Jon Jackson, one of the detainee's Pentagon-appointed attorneys.

Court proceedings against Khadr, who is accused of killing an American soldier in Afghanistan, are farthest along. But pretrial hearings are anticipated for several other detainees at Guantanamo this year.

Obama's order just two days into his presidency to close the prison by Jan. 22, 2010, was a symbolic break from Bush administration anti-terrorism policies, which Obama said cost the U.S. its stature around the world. But the president has had trouble lining up help from other countries and even his own political party. Republicans and some Democrats have vehemently opposed moving terror suspects to U.S. soil, citing security fears. About 50 detainees have been transferred to other countries under Obama. But the administration is still trying to reach a repatriation agreement with Yemen, a country that accounts for nearly half the remaining 198 detainees.

Meanwhile, the president has directed the government to acquire and upgrade the Thomson Correctional Center, a maximum-security facility in rural western Illinois, for some detainees. But it's not clear if Congress will approve the funds. Even if it does, authorities say it would take up to 10 months to upgrade security and add a courtroom there.

"The military can do some great things, but I don't see that happening before July," Jackson said.

Human rights advocates said more trials at Guantanamo would revive international criticism of the U.S.

"It's troubling not only that there will be a delay in closing Guantanamo, but also that there are preparations for trials taking place in Guantanamo, a place that symbolizes a lack of lawfulness and human rights violations over the last seven years," said Jamil Dakwar, an attorney with the American Civil Liberties Union.