Presumptive Republican presidential nominee Donald Trump said Thursday that reports of a private meeting between Attorney General Loretta Lynch and former President Bill Clinton left him "flabbergasted."

Lynch and Clinton met on Lynch's plane after she landed at the Phoenix airport Monday evening. Lynch has denied that the two spoke about the ongoing FBI investigation into Hillary Clinton's use of a private email server while secretary of state. However, Republicans and Democrats have criticized her for creating a possible conflict of interest, and some lawmakers have called for Lynch to recuse herself from the investigation.

"I actually thought ... 'No way, there's no way that's gonna happen' and it happened." Trump told Fox News' Sean Hannity. "I think it's amazing. I've never seen anything like that before."

The encounter between Lynch and Clinton took place the night before the House select committee investigating the 2012 attack on the U.S. Consulate in Benghazi released its report. The investigation criticized the Obama administration for huddling to craft a public response to the video even as military assets waited hours to deploy to Libya.

"Who wouldn't have sent help after you got the first messages?" Trump asked Hannity. "[Hillary Clinton] has bad judgement. [Ambassador Chris Stevens] is asking for help."

"She lied," Trump said of Clinton. "That's what she does. She lies."