WASHINGTON -- In a series of tweets Monday, President Donald Trump criticized Democrats for their inquiries into his administration, and called for a shift in focus to former President Barack Obama's business moves.

Instead of investigating reports suggesting that Trump is using his presidency to enrich his businesses, Democrats should look at Obama's book and Netflix deals, the president said.

"I have a better idea. Look at the Obama Book Deal, or the ridiculous Netflix deal," Trump tweeted.

The former president and former first lady Michelle Obama launched a film production company in partnership with Netflix last spring, reportedly a "high eight-figure deal," according to CNN.

They also secured book deals worth $60 million each, according to reports. Michelle Obama's book "Becoming" was published last year and quickly became a best seller.

"House Judiciary has given up on the Mueller Report, sadly for them after two years and $40,000,000 spent - ZERO COLLUSION, ZERO OBSTRUCTION. So they say, OK, lets look at everything else, and all of the deals that 'Trump' has done over his lifetime. But it doesn't... work that way," Trump tweeted.

Trump has previously called for an investigation into Barack Obama's book deal, despite it not being unusual for commanders in chief to publish books after their time in office. Former presidents Bill Clinton, George W. Bush and Ronald Reagan all authored books after their terms ended, for example.

In July Trump told reporters, "Let's look into Obama the way they've looked at me from day one... They could look into the book deal that President Obama made. Let's subpoena all of his records."

The tweets Monday come after Democrats have sounded the cry for an impeachment investigation, fueled by allegations that Trump has obstructed justice and is profiting off of his time in office.

Recently Vice President Mike Pence came under scrutiny for staying at a Trump-owned resort on an official trip to Ireland, and Trump was slammed for suggesting that next year's G-7 summit be held at one of his resorts in Florida.

Trump has repeatedly claimed that his time in office has not benefited his personal wealth or that of his companies.

"I will, and have always expected to, lose BILLIONS of DOLLARS... for the privilege of being your President," Trump also tweeted Monday.