moscow russian lawyer meet donald trump jr. 2016 election campaign say u.s. president son tell father elect could return issue u.s. law impose sanction russian officials relate death russian lawyer bloomberg report new york attorney alan futerfas represent donald trump jr. immediately respond request comment representative russian lawyer natalia veselnitskaya answer call seek comment june 2016 meet new york veselnitskaya donald trump jr along senior trump campaign officials become part investigation allegations russia interfere u.s. presidential election trump deny campaign collude moscow bloomberg quote veselnitskaya say interview moscow lobby so-called magnitsky law adopt washington response 2009 death sergei magnitsky whistle-blowing lawyer auditor supporters magnitsky say russian state murder deny adequate medical care prison tax evasion charge kremlin deny allegation interview bloomberg veselnitskaya quote donald trump jr say meet reference magnitsky law look ahead come power return issue think it accord bloomberg veselnitskaya also recall future president son say understand side may mess take long time get bottom it veselnitskaya say meet offer pass information pertain allege tax evasion wealthy democratic party donors say trump jr. ask document prove tax evasion document describe 20 minute meet failure russian lawyer say trump son offer return issue sanction law bloomberg