The Republican Governors Association will return donations it received from Steve Wynn last year in the wake of sexual misconduct allegations against the casino mogul that span decades.

RGA spokesman Jon Thompson said the group is giving back $100,000 it received from Wynn Resorts last year. The group is also canceling its plans to hold its 2020 conference at the Wynn Las Vegas.

The RGA called the allegations against Wynn “extremely serious.”

The group has received $2.5 million from Wynn Resorts over the last 18 years, but the RGA said the money cannot be returned as it has already been spent. The campaign contributions from Wynn Resorts were made as part of the RGA’s corporate membership program, of which Wynn Resorts is no longer a member.

Massachusetts Gov. Charlie Baker, a Republican, asked the RGA on Saturday to give back the donations it received from Wynn and Wynn Resorts, according to the Boston Globe.

Allegations of sexual misconduct against Wynn were brought to light by the Wall Street Journal on Friday. Multiple former female employees of the casino magnate accused Wynn of pressuring them to perform sexual acts or touching them inappropriately.

Wynn has stepped down from his position as finance chairman of the Republican National Committee.

Republican lawmakers who received campaign contributions from Wynn are facing pressure to return the funds they received.

Already, Sen. Rob Portman, R-Ohio, has donated his funds from Wynn to organizations fighting sex trafficking. House Speaker Paul Ryan, R-Wis., also plans to give the money he received from Wynn to a local charity, according to the Milwaukee Journal Sentinel.