Sen. Bob Casey will run for reelection in 2024, the Pennsylvania Democrat announced Monday, in a move to defend a seat in a critical swing state.

“I’m running for re-election because with so much on the line for Pennsylvania’s working families, I want to keep delivering results for Pennsylvania,” Casey said in a statement.

Pennsylvania is a key Senate battleground state where Democrats will be under pressure to defend their majority.

His reelection campaign focuses on working for Pennsylvania families, taking on China and breaking through gridlock in Washington, the statement says.

The 62-year-old senator quietly put together a fully operating campaign-in-waiting, POLITICO reported.

Casey has over $3 million in cash in his campaign coffers, according to his latest FEC filings.