BUFFALO, N.Y. (AP) Buffalo Bills coach Rex Ryan has hired his twin brother Rob to become a member of his staff.

Rob Ryan will serve as assistant head coach with a specific responsibility for defense, the Bills announced Sunday night. It marks the second time the two have worked together after previously serving as assistants on their father Buddy Ryan's staff in Arizona in 1994 and `95.

What's unclear is where Bills current defensive coordinator Dennis Thurman fits in the team's hierarchy.

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Rob Ryan was available after being fired as the New Orleans Saints defensive coordinator in mid-November. He was dismissed with the Saints defense ranking last in the NFL in yards and points allowed.

The Bills defense struggled in adapting to Rex Ryan's system in his first season in Buffalo.

UNDATED - Roger Goodell says the existing stadiums in St. Louis, San Diego and Oakland are ''inadequate and unsatisfactory,'' and the proposals the Rams, Chargers and Raiders received to remain in their current cities lacked certainty.

A person who has seen the report told The Associated Press on Saturday night that the NFL commissioner sent 48 pages to team owners and cited a lack of longer-term solutions in plans to build new facilities. The person spoke on condition of anonymity because the league has not released details of the report.

The Los Angeles Times first reported Goodell's comments.

A special owners meeting is scheduled next week for Houston, and relocation by one or two of those teams to Los Angeles will be discussed - and quite possibly voted on. All three franchises applied for relocation last week, and at least 24 teams must vote for a franchise to move.

Goodell did not draw any conclusions on which teams should move, nor did he recommend either of two stadium sites being proposed. The Rams are planning a stadium in Inglewood on the site of the old Hollywood Park racetrack. The Chargers and Raiders jointly are proposing a stadium in Carson.

MIAMI (AP) - Chicago Bears offensive coordinator Adam Gase was hired as the Miami Dolphins' ninth coach since 2004, and he'll try to end the team's seven-year playoff drought.

Gase was the NFL's hottest coaching candidate among assistants, and at 37, he becomes the league's young coach.

He also interviewed with the Eagles, Browns and Giants and had been considered the front-runner for the Dolphins job.

He was offensive coordinator for two years in Denver before joining the Bears.

The Dolphins chose Gase after interviewing six other candidates. Gase has no head coaching experience, but has been a target of NFL coaching searches for at least three years. A year ago he followed coach John Fox from Denver to Chicago after interviewing for head jobs with the Bears, Bills and Falcons.

Gase is a protege of former Dolphins coach Nick Saban and has won favorable reviews for his work with a range of quarterback talent - from Peyton Manning to Jay Cutler to Tim Tebow.

RENO, Nev. (AP) - Republican presidential hopeful Donald Trump said he doesn't watch professional football much anymore because the NFL has gone ''soft'' like the United States.

The billionaire also told about 3,000 people during a Reno rally he believes he's leading in Iowa, New Hampshire and Nevada, and if he wins Iowa's first-in-the nation caucuses next month ''we're going to run the table.''

Trump drew the football analogy during a campaign speech in a downtown ballroom while casino sportsbooks were jammed with fans across the street watching the NFL playoffs.

''Football has become soft like how the country has become soft,'' he said.

In recent years, the NFL has implemented various rules aimed at curtailing concussions among players amid rising concern over football safety, such as 15-yard penalties in many cases for helmet-to-helmet collisions and head-to-head blows.

NBA

NEW YORK (AP) - The Brooklyn Nets fired coach Lionel Hollins and reassigned general manager Billy King in the midst of their worst season since moving from New Jersey.

The Nets said assistant Tony Brown will serve as the interim head coach, and the GM position will remain open until a replacement is hired.

The Nets have lost four in a row overall and nine straight at home, where attendance has dwindled at the $1 billion Barclays Center. The Nets had made the playoffs every year since relocating for the 2012-13 season, but they are 10-27, better only than the league-worst Philadelphia 76ers.

King had been GM since 2010, orchestrating a number of high-profile moves that led to just one playoff series victory. Hollins was in his second season as coach

NHL

WASHINGTON (AP) - Alex Ovechkin scored his 500th goal, becoming the 43rd player in NHL history to reach the milestone.

Ovechkin reached the mark in vintage fashion, scoring from just beyond the left hash marks during a second-period power play to give the Washington Capitals a 5-1 lead over the Ottawa Senators.

Ovechkin got an extended standing ovation and took a skate around the rink, acknowledging the cheering crowd that included his parents. He later drew another roar while waving to fans from the bench.

He added No. 501 midway through third, beating a defender with a sweeping deke at the top of the zone before smacking a shot past goalie Andrew Hammond for a 7-1 lead.

At 801 games, the Russian winger is the fifth-fastest player to 500 goals, trailing only Hall of Famers Wayne Gretzky (575 games), Mario Lemieux (605), Mike Bossy (647) and Brett Hull (693).