The attorney for a 16-year-old accused of stabbing 21 other students and a security guard at their high school said Thursday he wants to have a mental health expert evaluate the boy and hopes to have the case moved to juvenile court.

For now, Alex Hribal is charged as an adult with four counts of attempted homicide, 21 counts of aggravated assault and a weapons charge, and is being held without bond in the Westmoreland County juvenile detention center.

In an interview with ABC's "Good Morning America," attorney Patrick Thomassey acknowledged that his client stabbed the victims, and said any defense he offers will likely be based on the boy's psychological state, which he hopes to have an expert evaluate soon.

"I would assume so, yes, depending on what the mental health experts tell me," Thomassey said.

He said that, under Pennsylvania law, he will have to convince a judge that Hribal can be rehabilitated in juvenile court, which would have jurisdiction over him until he's 21. If convicted as an adult, Hribal faces likely decades in prison.

The attorney told several media outlets that Hribal was remorseful, though he acknowledged his client did not appear to appreciate the gravity of his actions. Thomassey said he is still getting to know his client, saying he spoke with Hribal only for about 20 minutes before his arraignment late Wednesday.

Suspended state Sen. Leland Yee is due back in federal court for his alleged role in a San Francisco political corruption and organized crime case.

Yee could enter pleas Tuesday to one count of conspiracy to traffic in firearms without a license and to illegally import firearms, and to six counts of engaging in a scheme to defraud citizens of honest services.

The San Francisco Democrat is accused of conspiring to connect an undercover FBI agent with a Philippine arms dealer in exchange for campaign contributions, and of trading political influence for cash.

Yee and 19 others were formally indicted last week after being arrested on March 26.

Other defendants, including Raymond "Shrimp Boy" Chow, whose charges include money laundering and trafficking, are scheduled for arraignment Tuesday.

An inmate has pleaded guilty to murder in the stabbing death of a guard at a federal prison in Central California.

The U.S Attorney's Office says 48-year-old James Ninete Leon Guerrero, of Guam, entered the plea on Tuesday.

Prosecutors say Guerrero held Officer Jose Rivera down at the U.S. Penitentiary in Atwater in 2008 as another inmate, Jose Cabrera Sablan, stabbed him more than 20 times with an eight-inch shank. The 22-year-old Rivera - a U.S. Navy veteran - was doing a daily headcount when he was attacked.

Guerrero was serving a life prison sentence at the time in connection with an armed bank robbery. Prosecutors say under a plea agreement, he will receive another life term. Sablan is scheduled to go on trial in April.

Coast Guard officials in New Orleans say a petty officer has been convicted and sentenced on charges involving sexual assault and possession of child pornography.

Petty Officer 2nd Class Christopher C. Bush's court martial was held in Norfolk, Va.

A Coast Guard news release said the 28-year-old Bush was convicted Friday on four violations of a Uniform Code of Military Justice article dealing with rape and sexual assault and one involving child pornography.

The crimes involved a junior Coast Guard woman and a civilian woman. They happened between January 2010 and May 2013 while Bush was stationed at a unit in New Orleans. The Coast Guard said it was not releasing the name of the unit to protect the privacy of the victims.

The Supreme Court says whistleblower protections in a federal law passed in response to the Enron financial scandal apply broadly to employees of publicly traded companies and contractors hired by the companies.

The justices ruled 6-3 Tuesday in favor of two former employees of companies that administer the Fidelity family of mutual funds. The workers claimed they faced retaliation after they reported allegations of fraud affecting Fidelity funds.

The case involved the reach of a provision of the Sarbanes-Oxley Act, passed in 2002 in response to the Enron scandal, that protects whistleblower activity. The measure was intended to protect people who expose the kind of corporate misdeeds that arose at Enron.

A Russian court handed down prison sentences Monday of up to four years for seven people who took part in a 2012 protest against Vladimir Putin. An eighth defendant received a suspended sentence.

Hundreds of their supporters gathered outside the courthouse to condemn the trial and the Kremlin's crackdown on opposition. Police detained about 200 of them, accusing them of violating public order.

Among those detained were members of the punk band Pussy Riot who had spent nearly two years in prison as punishment for their own anti-Putin protest.

The defendants sentenced Monday were among 28 people rounded up after the May 6, 2012, protest on the eve of Putin's inauguration for a third presidential term. The rally turned violent after police restricted access to Bolotnaya Square, across the river from the Kremlin, where the protesters had permission to gather.

The eight defendants were found guilty last week, but sentencing was postponed until Monday. All have been in custody for nearly two years except for Anastasia Dukhanina, 20, who was under house arrest. She was given a suspended sentence.