WASHINGTON (Dow Jones)--U.S. Sen. Sherrod Brown, D-Ohio, on Wednesday insisted that climate legislation include tariffs on imports from countries that fail to adopt global warming policies, ratcheting up the rhetoric as Senate Democratic leaders seek to line up support within their caucus.

Speaking to reporters, Brown said that the "votes aren't there" unless climate legislation ensures that "countries that aren't subscribing to climate-change legislation and law don't get an advantage on everybody else." Ohio and other manufacturing states control a significant number of votes in the U.S. Senate.

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