Julian Castro, former secretary of Housing and Urban Development and current Democratic presidential candidate, released a plan Thursday that would tax inheritances of $2 million or more, raise the capital gains tax rate and provide a $3,000 per child tax credit in order to address issues of wealth inequality in America.

The subject has been a point of emphasis since Sen. Bernie Sanders' 2016 presidential campaign struck a cord with voters on the issue.

“Families working hard to make ends meet shouldn’t pay more in taxes than the wealthiest earners. My new plan would put working families first: providing critical relief to families who count on a paycheck, and ensuring the wealthiest Americans pay their fair share," Castro said in a statement to NBC.

The plan, which he has titled the "People First Economic Plan for Working Families," also calls for investing in child care and paid family/medical leave and implementing a $15 an hour minimum wage.

"We know today that in our country there are a lot of families that are working hard, but are not getting ahead the way that they would like to, or the way that they ought to be, or the way that they used to be in years past," Castro said.

Castro has implemented similar plans in past roles. As the mayor of San Antonio, Texas, Castro called for an increase to the sales tax, which covered the cost of full-day pre-kindergarten in the city.

“I believe we need to make sure that every child can have good child care and yet a great early education,” Castro said. “I also believe, as a matter of politics, that making these programs available to middle class and upper middle class families is a powerful way to create a strong coalition to get them done and that we ought to do that.”

Castro is still looking for his poll numbers to rise in one more poll in order to qualify for the September Democratic debate.