WASHINGTON — Northwestern University athletes pressed their case for collective bargaining rights during meetings Wednesday with lawmakers, as a vote was scheduled for them to decide whether to authorize a union.

The vote will be held April 25, according to Ramogi Huma, president of the College Athletes Players Association.

During meetings on Capitol Hill, Huma and former Northwestern quarterback Kain Colter tried to drum up support just a week after a ruling that the athletes were employees and had the same rights to bargain collectively as other workers.

“Health and safety of athletes is the concern, especially to reduce the risk of brain trauma,” Huma said.

Added Colter, co-founder of the association: “We’re up here raising awareness.”

Even though the issue is not directly before lawmakers, “Congress is an important part of the chess board,” he said after meeting with Sen. Sherrod Brown, D-Ohio.

Brown said in a statement that “the right to fair treatment is why all workers, no matter the job or venue, should have the opportunity to unionize.”

“College athletes dedicate the same hours to their support as full-time employees and deserve the same protections as any other worker,” he said.

Colter and Huma were accompanied by Tim Waters, national policy director of the United Steelworkers union, which is underwriting and financing the effort.

More meetings were scheduled Thursday.

“We’re up here to let the leadership know what’s going on, basically getting information out,” Huma said.

The Chicago-region director of the National Labor Relations Board ruled last week that Northwestern’s football players on scholarships are employees of the university under the National Labor Relations Act and therefore have the right to vote to unionize.

Northwestern, based in Evanston, Ill., has said it will appeal the ruling. It has until April 9 to do so. The full NLRB has yet to weigh in on the finding.

Stacey Osburn, director of public and media relations for the NCAA, said in a statement that Huma’s concern was “unwarranted.” A Northwestern official has said that the students were not employees and that unionization and collective bargaining were not the appropriate methods to address their concerns.

“The law is fairly clear and consistent with Northwestern’s position, so the NCAA has made no contacts with anyone in Congress attempting to ban the unionization of student-athletes,” Osburn said.

Colter, however, called the decision a “strong ruling” and predicted it “will be hard to overturn.”

The NLRB does not have jurisdiction over public universities, so the push to unionize athletes has been primarily targeted toward private schools such as Northwestern.

Rep. George Miller of California, the top Democrat on the House Education and the Workforce Committee, said after a meeting with the Northwestern group that “what they’ve drawn up here is a list of concerns that they have as athletes in Division I schools where there is clearly an imbalance in the relationship. And they’re seeking the right to form a union for the purposes of putting some balance back in that relationship.”