ANDREA SHALAL  THE United States has condemned all foreign military involvement in Libya, including the use of mercenaries and private military contractors, and said Libyans themselves must rebuild a unified country. U.S. President Donald Trump had spoken with several world leaders about Libya in past weeks, and it was clear there was "no winning side," U.S. national security adviser Robert O'Brien said in a statement on Tuesday. He did not name the leaders. Trump discussed the need to de-escalate the situation in Libya in recent weeks with French President Emmanuel Macron, Egyptian President Abdel Fattah Al Sisi and Crown Prince…