He was not told he could have access to Mexican consular officials, in violation of the Vienna Convention. The Obama administration has urged Texas to delay the execution of a Mexican man, saying it would put the US in breach of international obligations.
“The imminent execution of petitioner would place the United States in irreparable breach of its international law obligation,” US Solicitor General Donald Verrilli wrote in the brief.
It would have “serious repercussions for United States foreign relations, law enforcement and other co-operation with Mexico, and the ability of American citizens travelling abroad to have the benefits of consular assistance in the event of detention”. via bbc.co.uk