By Joseph Ax Sept 7 (Reuters) - As the unofficial start of the campaign sprint kicks off on Labor Day Monday, President Donald Trump's deep unpopularity is imperiling Republican chances of maintaining their narrow majorities in Congress with just two months before November's midterm elections.

American citizens who work in border towns are moving to Mexico and regularly commuting into the U.S. to escape the affordability crisis gripping the States. Laredo, Texas, is the capital of Webb County,