There has been some squabbling in the Senate over the appointment of members to a conference committee with the House try to iron out the differences between the chambers over their separate version of the FY 2014 budget. Conservative members of the Senate — led by Sens. Ted Cruz (R-TX), Rand Paul (R-KY), and Mike Lee (R-UT) — have objected to the appointment of conferees over concern that a budget agreement would be used for a backdoor national debt increase.

Sen. John McCain (R-AZ) once again attacked these fiscal conservatives. “What we’re saying here on this side of the aisle is we don’t trust our colleagues on the other side of the Capitol who are in the majority,” said McCain, according to Bloomberg.

Cruz responded to McCain yesterday on the floor of the Senate, noting that the fiscal mess in which the United States finds itself is the creation of both parties.

“Madam President, [McCain] urged the body to trust the Republicans,” said Cruz. “Let me be clear — I don’t trust the Republicans. And I don’t trust the Democrats. And I think a whole lot of Americans likewise don’t trust the Republicans and the Democrats, because it is leadership in both parties that has gotten us in this mess.”

“You know, my wife and I have two little girls at home, they’re 5 and 2. When Caroline was born, our national debt was $10 trillion,” he noted. “Today, it’s nearly $17 trillion. In her short five years of life, the national debt has grown by over 60%. Madame President, what we are doing to our kids and grandkids, I think, is immoral.”

Watch the full video of Cruz’s response to McCain below:

McCain is quickly making himself a target for a primary challenge in 2016, should he decide to run for re-election. The Senate Conservatives Fund, which has been a force in primary races around the country, sent around a e-mail yesterday yesterday openly floating the prospect of a conservative challenge to McCain.

“How much longer can we tolerate John McCain and his hostility toward conservatives and our principles?” the conservative organization asked. “He already lashed out at Senators Paul, Lee, and Cruz earlier this year, calling them ‘wacko birds’ for standing up for the Constitution. Now he’s at it again.”

The e-mail included a link to a poll asking members if they believe that McCain should be primaried in 2016.