UPDATED, Aug. 5: State Senator Ken Donnelly, the majority whip, underwent successful brain surgery Tuesday, Aug. 2, when doctors removed a brain tumor, his website reports. He is now at home in Arlington, the State House News Service reported.

The Boston Globe reported Thursday, Aug. 4, that doctors called the surgery “very successful.”

Cindy Friedman, his chief of staff, told The Globe that when saw the senator Wednesday morning, he was recovering well and his spirits were high.

He faces reelection unopposed in November, and Friedman said he would continue to represent his district.

The story quotes a number of colleagues, citing Donnelly's strength.

"His medical team is very pleased with the outcome of the surgery and he is resting comfortably," a Facebook post says in an earlier post.

"The family is overwhelmed with all the love and support they have received. Please keep all the positive energy flowing in his direction.

"We will update you when we have information on where to send cards, etc."

WCVB reports first reported Aug. 1 that Donnelly had experienced difficulties and was admitted to Mass. General Hospital Sunday, following a marathon session of the state Legislature.

Donnelly represents the Fourth Middlesex district, which includes Arlington, Billerica, Burlington and most of Lexington and Woburn.

"His family asks that you send all your good wishes and prayers," the post said.

Cindy Friedman, Donnelly’s chief of staff, told Boston.com she did not have any further information Sunday night.

"We’re all rooting for the best for him. He deserves all our good wishes and prayers," she said in an email to The Globe.

This news report was published Monday, Aug. 1, 2016, and updated Aug. 5.