Trump called Turkey's Erdogan to congratulate him on referendum win - Turkish sources

ANKARA (Reuters) - U.S. President Donald Trump called Turkish counterpart Tayyip Erdogan to congratulate him on winning a referendum expanding his authority, sources in Erdogan's palace said on Monday.

Turkey voted on Sunday to switch to a presidential system, greatly increasing Erdogan's powers. Unofficial results, which the opposition said it would challenge, showed a narrow victory for him with 51.4 percent of votes cast in favour.

(Reporting by Ece Toksabay; Editing by Mark Trevelyan)