Former President Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week MORE reportedly made $400,000 for an appearance and interview last week at an A&E Networks advertising event.

The former president was interviewed at The Pierre Hotel in Midtown Manhattan by presidential historian Doris Kearns Goodwin, The New York Post reported. The “History Makers” event, which lasted 90 minutes, was conducted in front of the cable network's advertisers and hosted by A&E chief Nancy Dubac.

During the event, the former president was asked what he missed most about the White House and how he dealt with frustrating moments when he was president.

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“For starters, by not having a Twitter account,” Obama reportedly quipped in response.

A source who attended told the Post that Obama said he missed sitting on the Truman Balcony of the White House in the summer and looking upon the Washington Monument and Lincoln Memorial.

He also told the audience about his transition back into civilian life, saying he still hasn’t driven a car and is learning how to use the coffee machine in his new D.C. home.

Obama has faced criticism recently, after a report that he agreed to speak at a Wall Street firm's healthcare conference for $400,000.

He will appear at the Cantor Fitzgerald LP conference in September.

Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) last week said she was "troubled" by the speaking fee the former president is reportedly receiving for that appearance.

Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) also expressed disappointment in the former president's decision.

"I think at a time when people are so frustrated with the power of Wall Street and the big-money interests, I think it is unfortunate that President Obama is doing this," Sanders said last week.

"Wall Street has incredible power, and I would have hoped that the president would not have given a speech like this," he added.

A spokesman for Obama rejected the idea that Wall Street would sway Obama, pointing to the financial reforms implemented during his time in office.