US President Donald Trump will tell Erdogan at a meeting in Washington about the inadmissibility of the presence of Russian S-400 systems in Turkey, said US Assistant to National Security Robert O’Brien.

According to the White House, the US Congress will approve sanctions against Turkey if it does not get rid of the Russian S-400 systems, TASS reported.

There will be a meeting between Erdogan and the US president on Wednesday in Washington. The parties intend to discuss issues related to the Turkish invasion of northern Syria and a number of other tasks.