AP NewsBreak: Miss. Sen. Thad Cochran resigning April 1

In this Jan. 10, 2018, file photo Sen. Thad Cochran, R-Miss., returns to the Capitol for a vote in Washington. Cochran tells The Associated Press he will resign April 1 because of health problems. The 80-year-old has had Cochran stayed home for a month last fall with urinary tract infections, returning to Washington in October to give Republicans the majority they needed to pass a budget plan. (AP Photo/J. Scott Applewhite, File)

JACKSON, Miss. — Longtime Republican Sen. Thad Cochran of Mississippi said Monday he will resign because of health problems — triggering what could be a chaotic special election to fill the seat he has held for a generation.