WASHINGTON (AP) - The Senate has approved an amendment that would limit the amount of government subsidies the wealthiest farmers receive when purchasing crop insurance.

The amendment is the biggest victory so far for critics of a massive, five-year farm bill that would cost almost $100 billion a year and includes generous subsidies for the nation's biggest crops. Supporters have deflected other attempts this week to reduce government help for agriculture, including efforts to trim sugar subsidies and crop insurance.

The amendment by Sens. Dick Durbin of Illinois and Tom Coburn of Oklahoma would reduce the government's share of crop insurance premiums for farmers with adjusted gross incomes of more than $750,000. It was approved 59-33.

Currently the government pays for an average 62 percent of crop insurance premiums.

YORBA LINDA, Calif. (AP) - Two hundred American former prisoners of war who were taken captive during the Vietnam War are arriving in Southern California to celebrate the 40th anniversary of their release.

The three-day gala starts Thursday at the Richard Nixon Presidential Library & Museum in Yorba Linda. It will include a military flyover, wreath-laying ceremony and tours of a special exhibit on the prisoners' return home.

The reunion runs through Saturday and marks the 40th anniversary of a special White House dinner hosted by President Nixon on May 23, 1973, to honor the 571 American captives.

Nixon resigned a year later in the face of impeachment over Watergate, but many of the former POWs regard him as a hero for securing their freedom.

DENVER (AP) - Contraception coverage by for-profit companies faces a prominent test in Denver.

Hobby Lobby Stores Inc. is asking a federal appeals court for an exemption from part of the federal health care law. Hobby Lobby says it shouldn't be required to offer health coverage that includes access to the morning-after pill.

The Oklahoma City-based arts-and-crafts chain argues that businesses - not just religious groups - should be exempted from that part of the health law if it violates their religious beliefs.

Lower courts have rejected Hobby Lobby's claim, saying that secular for-profit companies aren't exempt from the requirement.

The 10th Circuit is hearing the case Thursday before all nine judges, indicating the case's importance.