article_snippet: FBI agents search office of Florida doctor known as Senator's donor .
article_snippet: Investigators have focused in part on plane trips Menendez took in 2010 to the Dominican Republic as a guest of Melgen.
article_snippet: Prosecutors also are focusing on whether Menendez broke the law in advocating for Melgen's business interest in a Dominican Republic government contract for a port screening equipment.
article_snippet: The U.S. Customs and Border Protection agency, at the time, considered donating port screening equipment to the Dominican Republic, which would have hurt the contract of Melgen-controlled company.
article_snippet: During a Senate subcommittee hearing in 2012, Menendez didn't mention ICSSI, Melgen's company, by name, but Menendez did press Deputy Assistant Secretary of State Matthew Rooney about an unnamed company who had a contract to X-ray cargo that went through all Dominican ports -- a contract that, Menendez said, Dominican authorities "don't want to live by.
article_snippet: And that puts American companies at a tremendous disadvantage.
article_snippet: Other lines of inquiry against Menendez had included  allegations Menendez solicited prostitutes in the Dominican Republic, and that Menendez violated the law helping win permanent U.S. residency for two Ecuadorian banking magnates, the Isaias brothers.
article_snippet: allegations he solicited prostitutes in the Dominican Republic collapsed after the purported prostitutes recanted the purported prostitutes story, and the FBI didn't find evidence of wrongdoing in the Isaias matter, according to people briefed on the probe.
article_snippet: the government is also pushing to use emails between Menendez's office and a CBP official about the Dominican ports issue.