washington head u.s. department interior come scrutiny thursday amid media report attend republican fundraiser march government trip caribbean politico cite department travel record document say ryan zinke attend virgin islands republican party fundraiser donors pay 5,000 per couple photograph secretary report come multiple investigations former one-term congressman travel serve trump administration announce week follow various media report subject monday interior department watchdog agency say probe zinke travel recent report use private plane own oil executive tuesday u.s. office special counsel say investigate whether break law june give speech professional hockey team own political donor cabinet members also scrutinize use taxpayer money expensive private travel rather less expensive commercial trip former u.s. health human service secretary tom price resign friday follow uproar use costly private charter plan u.s. treasury secretary steve mnuchin u.s. energy secretary rick perry environmental protection agency administrator scott pruitt also come question private plane use question also raise cost security u.s. education secretary betsy devos democratic house lawmakers early week call zinke disclose full detail privately charter airplane trip letter secretary lawmakers point one report 12,000 private flight nevada montana route say commercial airlines charge little 300 abuse taxpayer money far problem trump administration group 26 lawmakers write tuesday representatives zinke immediately respond request comment politico report thursday separately top democrat house oversight government reform committee say seek information private non-commercial military flight take white house counselor kellyanne conway u.s. representative elijah cummings statement release wednesday also say seek evidence price repay u.s. taxpayers private flight representatives white house say thursday u.s. agencies responsible arrange transportation cabinet members occasionally invite relevant white house staff official travel plan secure invite agency u.s. interior secretary raise political fund government trip report