President Trump will welcome Turkish president Recep Tayyip Erdogan to the White House on Wednesday — the leaders’ first meeting since a diplomatic clash over Turkey’s military offensive in northern Syria — as Congress opens the first public impeachment hearings into the U.S. president.

Trump will be trying to move past the episode in Syria that he helped trigger by pulling U.S. troops out of the region, where they were maintaining peace between Turkey and the American-allied Kurdish forces that helped defeat Islamic State. At the same time, Trump is expected to increase pressure on Erdogan over his decision to purchase a Russian anti-aircraft missile system despite American admonitions.

The meeting comes as Trump faces the first of several public hearings in the U.S. House over whether he has abused his power by conducting foreign policy for his personal benefit, meriting impeachment. Turkey has featured in reports related to Trump’s controversial conduct. Before directing an effort to force Ukraine to investigate Trump’s political rivals, Rudy Giuliani — the president’s personal lawyer — lobbied the White House to deport a Turkish dissident Erdogan blames for a failed 2016 coup.

This will be Erdogan’s second visit to Washington since Trump’s inauguration. During his first, in May 2017, his personal security forces attacked peaceful protesters and scuffled with Washington police outside the Turkish ambassador’s residence, an incident that foreshadowed a deterioration in relations with the U.S.

Wednesday’s meeting, which will include a joint news conference, will require a balancing act by Trump. He is under pressure from Congress to persuade Erdogan to abandon the Russian missile system — the S-400 — or else to impose stiff economic sanctions. But Trump is also eager to preserve his personal relationship with the Turkish leader, as well as an important strategic relationship with the most problematic member of the NATO alliance.

Members of Congress in both parties have preemptively condemned Erdogan’s White House visit in light of the Syria offensive, which followed a telephone call in which Trump agreed to withdraw U.S. forces from a region near Turkey’s border. Democrats and Republicans have said Trump’s decision amounted to a green-light for Erdogan’s offensive and signaled U.S. abandonment of Kurdish forces that helped defeat Islamic State.