'We're not timing anything based on domestic politics' of the two sides, says Robert O'Brien, confirming Israeli reports that Trump administration may release proposal within weeks

Presidential adviser's first trip to region since replacing Jason Greenblatt is also the first senior US visit since Friday killing of top Iranian commander Qassem Soleimani

US delegation holds talks on bilateral ties with Gantz and Lapid, currently trying to put together a new government

White House adviser will also convene with Netanyahu, is reportedly seeking to assess prospects of government being formed as US peace plan remains on hold

Avi Berkowitz, 30, is a protégé to Trump's son-in-law, having worked under him in real estate, media, on the campaign trail and at the White House