SYDNEY, Australia — A prominent Australian lawmaker at the center of intensifying concerns about Chinese interference in Australian politics said Tuesday he would resign because his “ongoing presence” detracts from his party’s mission.

The senator, Sam Dastyari, of the opposition Labor Party, said on Tuesday he would not return to Parliament next year. His announcement follows months of intense media scrutiny in which he has fended off accusations that he pushed China’s foreign policy interests after taking money from Chinese-born political donors.

“I’ve been guided by my Labor values, which tell me that I should leave if my ongoing presence detracts from the pursuit of Labor’s mission,” Mr. Dastyari, 34, said at a morning news conference. “It is evident to me we are at that point, so I will spare the party any further distraction.”

The lawmaker had been in the Senate for four years and had been considered by some a rising star in Australian politics.