Presidential candidate Mike Bloomberg on Tuesday rolled an ambitious plan to rein in Wall Street, echoing platforms of some of his more liberal Democratic rivals.

Bloomberg's plan would bolster many of the reforms either put in place or strengthened as part of the 2010 Dodd-Frank Act in response to the Great Recession, a crisis that some blamed on Wall Street banks.

The billionaire, who made his own fortune on Wall Street, has now spent at least $400 million in advertising for his campaign, according to Kantar Media.

Bloomberg was mayor of New York from 2002 to 2013, during the financial crisis and its aftermath. During that time, he pushed back against certain proposals to tighten banking oversight, calling them "shortsighted" and contending they would "provide major advantages" to foreign competitors.

As presidential candidate, Bloomberg appears to be moving to the left of that stance. He said in a statement Tuesday, "The financial system isn't working the way it should for most Americans."

Here are the priorities in Bloomberg's Wall Street plan, according to a campaign press release:

Strengthen reforms put in place following the Great Recession to regulate banks and protect consumers, including the Volcker Rule and Consumer Financial Protection Bureau.

Restore funding to the Office of Financial Research that monitors bank riskiness.

Enable the Department of Justice to put individuals in jail for "infractions."

Introduce a 0.1% financial transaction tax.

Bloomberg said as president he would toughen the Volcker rule, which limits banks' proprietary trading, or trading stocks for their own gain. Merging mortgage giants Fannie Mae and Freddie Mac into a single entity, according to the proposal, would make the two institutions more efficient.

Bloomberg would "restore and strengthen" the Consumer Financial Protection Bureau to protect consumers," after the agency has been weakened under President Donald Trump's administration.

The call for increased oversight in some ways mirrors proposals from fellow presidential hopeful Sen. Elizabeth Warren, an advocate of the 2010 Dodd-Frank Act, who played a key roll in launching the CFPB. Warren has made financial reform a key part of her presidential platform, including a push to increase oversight of bank deals, a process she has called "fundamentally broken."