Taking aim squarely at Republicans, Hillary Clinton gave her strong support to President Obama's controversial executive actions on immigration, telling backers at a stop in Las Vegas that she wants to expand those plans to ensure that even more people who are in the United States illegally will not be deported in the future.

"I will fight for comprehensive immigration reform and a path to citizenship for you and your families across our country," Clinton said, declaring her full support for Mr. Obama's immigration changes.

"If Congress continues to refuse to act, as President, I would do everything possible under the law to go even further," Clinton added, as she slammed Republicans for opposing a path to citizenship for those in the U.S. illegally.

The appeal for action on immigration came in a state where the Hispanic vote will be very important in 2016, as Clinton outlined a stance that is certain to draw Republican attacks in the months ahead.

A few hours before Clinton's remarks on immigration, national Democrats proposed a plan for a series of a half dozen primary debates among their party's contenders.

"Looking forward to a real conversation," Clinton tweeted.

"If Governor O'Malley decides to run, we will expect a full, robust, and inclusive set of debates—both nationally and in early primary and caucus states," said Lis Smith, a spokesman for Martin O'Malley.

Democrats would hold one debate in each of the four early voting states of Iowa, New Hampshire, South Carolina and Nevada; no details have been set for the dates, or the locations of the other two debates.

National Republicans have already set out a plan for a dozen primary debates. The first is to take place in mid-August in Ohio.