President Donald Trump's trade war with Canada is escalating as the midterm elections approach, threatening Republican efforts to address voters' economic concerns in a year when control of the U.S. Senate hinges on states along the border between the United States and its northern neighbor.

Rather than saying that President Donald Trump's order is legal, the high court said Monday it was too early for Democratic-run states to challenge it in June, when they convinced a federal judge in Boston to freeze the order for November's election.

The two-week runoff window since the two Republicans were the top vote-getters in an Aug. 11 primary has been a slugfest.

On Tuesday, Republican voters in South Carolina will vote to replace the late Sen. Lindsey Graham on November's ballot in a runoff between his sister Darline and Congressman Ralph Norman. As South Carolina ETV's Gavin Jackson reports, the closing days of this electoral sprint featured a major debate gaffe and a campaign rally with President Trump.

Oklahoma Republicans will return to the polls Tuesday to settle an expensive nomination fight for governor, while Democrats will pick a nominee for U.S. Senate.

South Carolina Republicans will return to the polls Tuesday for the fourth time since June to replace the late U.S. Sen. Lindsey Graham on the fall general election ballot.

Residents of Georgia's 13th Congressional District outside of Atlanta will get a new representative to Congress after a special election runoff Tuesday to replace the late Democratic Rep. David Scott, who died April 22.