America, as the planet's most powerful nation, can offer crucial help.
Turkey's relationship with the U.S. has been strained for months.
At the White House meeting, Trump lauded Erdogan as an important ally in the "fight against terrorism."
Turkish nationalist Sedat Peker has suggested Turkey should kill the presidents of European countries that defy Erdogan.
Tensions continue to rise between Turkey and Germany as Erdogan campaigns for his constitutional referendum.
Europe-Turkey relations have soured following the president's crackdown on opponents and spats over referendum rallies.
Demonstrators fear the April referendum will give the Turkish president license to go after Kurds if voters approve it.
Dutch government barred Turkish ministers from speaking in a diplomatic row over Turkey's attempts to rally Erdogan supporters overseas.
The Turkish president recalls the Nazi era to describe Germany's decision to cancel pro-Erdogan political rallies planned by the country's Turks.
Opponents fear a surge in authoritarianism as President Erdogan seeks more power
Prime minister signs defense deal, cautions Turkey on human rights abuses.
More than 110,000 have been removed from their jobs and 37,000 arrested since President Erdogan began his crackdown.
Erdoğan controls the press, targets opponents and falsely smears them.
Authorities order the arrest of the editor and senior staff of the nation's leading opposition newspaper.
Number 1: How did Erdoğan, born into poverty, become a billionaire?
Opponents fear the president is eliminating all dissent in the wake of a failed coup attempt.
Turkey and NATO need each other, and the U.S. has to make that clear.
Turkish president has been accused of using the failed coup to consolidate power as thousands are arrested in crackdown.
Head of the liberal Free Democrats likened the Turkish crackdown after a coup attempt to Hitler's use of the Reichstag fire to curtail civil liberties.