HELENA, Mont. (AP) — Montana Democratic Sen. Jon Tester is reporting his biggest fundraising quarter yet as his re-election battle with Republican Rep. Denny Rehberg intensifies.

A fundraising report released Thursday says the freshman senator brought in nearly $2 million over the past three months.

The Democrat is reporting about $3.6 million on hand as both sides accumulate money for costly television advertising, field campaigning and constant travel.

Rehberg has not yet reported his most recent numbers. Generally, he has trailed the incumbent in fundraising.

The Republican has been attacking Tester on the campaign trail as a backer of President Barack Obama's policies.

Tester has touted his record improving veterans' facilities in the state, and attacked Rehberg as a do-nothing career politician.