WASHINGTON – Sen. Bill Nelson said Monday he has many unanswered questions following a visit to the Homestead facility housing young immigrants and asserted it's "obvious" there is no plan for reuniting those children with their parents.

Speaking with reporters at the Capitol, Nelson flashed irritation about being told that the person responsible for that job was not available Saturday because she works Monday through Friday.

The Democrat, locked in a tight re-election campaign, tried "numerous times" to call that person on Monday morning "with no response."

Nelson was also denied a chance to talk to children there, including 70 he was told were separated from their parents amid the Trump administration's zero tolerance policy. He was told they were making phone calls to parents, which would indicate some reunification effort.

(Earlier, Nelson was told there were 94 such children at the facility, though it's unclear if some were taken elsewhere.)

Nelson said he would be asking questions of HHS Secretary Alex Azar during a Senate Finance Committee hearing on Tuesday. "I will be asking, 'Mr. Secretary, what are you hiding?' "

Nelson also suggested politics are at play because Republican Sen. Marco Rubio was able to get into the facility on Friday before Nelson's Saturday visit. Nelson initially tried to get in on Tuesday but was denied at the door, saying he needed to give two week notice.

"This is the most partisan administration in all my years of representing Florida up here," Nelson said, adding he was including his time in the House.

He did not fault Rubio for seeing the shelter himself.

Rubio's office has not yet responded to a question of when he lined up his visit. But the senator responded via Twitter, saying members of congress were offered different times to visit and he chose Friday.

Actually, the press got to tour the Homestead facility before either one of us at 10am Friday. DHS offered members of congress a choice between two seperate times to visit Homestead facility, 1pm Friday & 1pm Saturday. I picked Friday. https://t.co/T12Alia9RX — Marco Rubio (@marcorubio) June 25, 2018

Rubio is correct on that point. Members of Congress were informed Wednesday — after Nelson was first denied — they could visit either Friday or Saturday.

An email from HHS that is opening up facilities to members of Congress: pic.twitter.com/03G4wjMdwz — Alex Leary (@learyreports) June 21, 2018

Nelson's office did not respond to follow-up questions about his remarks.