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Democratic U.S. Senator Jon Tester is hoping Montanans will give him a narrow victory this fall. But President Donald Trump isn’t making it easy.

Republicans need a net gain of just three or four seats to take over the Senate and — assuming they keep the House — consolidate influence on Capitol Hill. Despite the favorable election arithmetic, Republicans are foundering in several key Senate races and face an uphill battle.

Republicans retain hopes of retaking control of the Senate. They lost the majority in 2006, in part because of the razor-close victory of Democratic challenger Jon Tester in Montana. Now, Tester is the incumbent facing a tough challenge of his own against the state's sole member of the House.

Sen. Jon Tester, a Democrat, sent a letter to Rep. Denny Rehberg, the Republican who seeks to unseat him, requesting a truce on outside money funding negative ads for their campaigns, meaning superPACs.

Sen. Jon Tester has proposed a constitutional amendment to reverse the Supreme Court's Citizens United decision. On All Things Considered Monday, Tester explained to co-host Melissa Block his opposition to Citizens United and the concerns he has about what he sees as its negative impact on American democracy.