In March, Maduro accused the US of trying to kill his opponent in the bid for President, right after accusing the US of giving Chávez cancer that led to the seat being empty in the first place.
Some US politicians asked for a recount after the Venezuelan election, as has become customary. There was no recount.
http://www.reuters.com/article/2013/03/17/us-venezuela-elect...
http://edition.cnn.com/2013/03/12/world/americas/venezuela-c...