Muller said he did not discuss his lobbying activities with Melgen, even though they were both involved with GFS.
Both Muller and Melgen also have fundraising ties to Menendez. Muller gave $5,000 to Menendez' New Jersey Senate re-election campaign in 2011. Melgen has been a staunch supporter, giving more than $14,000 directly to Menendez since the late 1990s and, through his eye clinic, donating $700,000 last year to a "super" political committee that supported Democratic Senate candidates. The committee, in turn, spent $582,000 to back Menendez' campaign.
AP Writers Erica Werner in Washington and Ezequiel Abiu Lopez in Santo Domingo contributed to this report.