U.S. Sen. Frank Lautenberg, New Jersey’s 86-year-old senior senator, was diagnosed with treatable stomach cancer in the last 24 hours and will begin chemotherapy today.

The Democrat still plans to finish out his current term – his fifth in the Senate – and seek re-election in 2014.

“This doesn’t change any of that,” Lautenberg’s chief aide, Dan Katz, said of the senator’s political plans. “After he receives his treatment, back to normal.”