JEFFERSON CITY, Mo. (AP) — Democratic U.S. Sen. Claire McCaskill, who faces a tough re-election bid in Missouri, teamed up Wednesday with Ohio Sen. Rob Portman — an oft-mentioned potential Republican vice presidential candidate — to push for a new way of relaxing tariffs on some materials imported by U.S. manufacturers.

The senators said they hoped their proposal could be debated in the coming days as an amendment to a business bill pending in the Senate. McCaskill also has filed the tariff measure as a stand-alone bill with 20 Republican co-sponsors, including Portman and Senate Minority Leader Mitch McConnell, of Kentucky.

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