US President Joe Biden sent a letter to leaders of key Capitol Hill committees on Wednesday informing them of his intention to begin the formal notification process for the sale of Lockheed Martin F-16 aircraft to Turkey once Ankara completes Sweden’s NATO accession process. In the letter to the top Republican and Democratic members of the Senate Foreign Relations and House of Representatives Foreign Affairs committees, Biden urged Congress to approve the sale “without delay,” a US official said. Earlier on Wednesday the White House sent a letter to members of Congress urging approval of the $…