Trump pledges $5K checks if Republicans do well in the midterms. Can he legally do that?

President Trump's pledge to give $5,000 to every U.S. adult if Republicans keep control of both chambers of Congress in the midterm elections has raised questions over whether the plan could cross legal lines. The president announced the so-called "Trump dividends" on the first night of the Republican National Committee's (RNC) midterm convention in Dallas this...