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Story highlights

President Donald Trump lamented Senate rules on Twitter on Tuesday

Congressional negotiators worked with Democrats to avert a shutdown until at least September

(CNN) —  

President Donald Trump tweeted Tuesday that the country needs a “good ‘shutdown,’” as well advocated for changing Senate rules, in a pair of tweets where he complained about the congressional negotiating process.

“The reason for the plan negotiated between the Republicans and Democrats is that we need 60 votes in the Senate which are not there! We … either elect more Republican Senators in 2018 or change the rules now to 51%. Our country needs a good ‘shutdown’ in September to fix mess!” Trump said Tuesday in two consecutive tweets.

Democrats quickly hopped on Trump’s call for a shutdown, including Hawaii Sen. Brian Schatz, who tweeted, “The President just called for a government shutdown this fall. No President has ever done anything like this.”

Congressional leaders announced Sunday that they’d reached a deal to avert a government shutdown until September. The deal did not include several Trump campaign promises – including money for a border wall – in part because GOP leaders needed Democratic votes to pass the deal in the Senate.

Office of Management and Budget director Mick Mulvaney on Tuesday took to the White House briefing room to slam Democrats’ claims of victory in the budget deal, arguing that Trump secured a large increase in defense spending and pushed border wall funding to its highest level in a decade.

Mulvaney also responded to Trump’s tweet Tuesday morning about a potential September shutdown.

“A shutdown is not a goal,” Mulvaney said, but rather a “negotiating tool to an extent.”

He added a shutdown would show American voters that Washington “really was as broken as they thought it was when they voted for (Trump) for president.”

Senate rules require 60 votes to break a filibuster – a tool Democrats have shown in the past they’re willing to employ (most notably during the Neil Gorsuch Supreme Court fight), and which they would likely use again to prevent passage of Trump’s budget proposal when it comes up again in September.

The President’s suggestion that we “change the rules now to 51%” is a variation of the so-called “nuclear option” that Republicans deployed during the Gorsuch Supreme Court fight – when they lowered the number of votes needed to break a filibuster of a judicial nominee. In this case, Trump is proposing a rule change that would also lower the number of votes needed to break a legislative filibuster, something Republicans left untouched when they changed Senate rules for Gorsuch.

RELATED: White House, Democrats claim victory in budget deal

The shorter-term spending deal brokered by Congress last week is a continuing resolution that, unlike standard budget legislation, is passed through reconciliation and is therefore not subject to a filibuster.

While Republicans do have majorities in both the House and Senate, their 52-seat Senate majority is too thin to break a filibuster unless eight Democrats side with the GOP.

That current deal, which has yet to be voted on and funds the government through September, simply set Republicans and Democrats on a collision course further down the road – a confrontation that Trump seems eager to embrace.

RELATED: What’s in and what’s out in the latest government spending bill

A CNN/ORC poll from March found that 72% of Americans want to see Trump to reach bipartisan compromises rather than try to pass laws he thinks are right for the country, even if they aren’t supported by Democrats. That includes a majority of Republicans (57%) who said Trump ought to be compromising with Democrats.

And that cuts both ways – in the same poll, 69% said Democrats ought to be trying to compromise with Trump and not just resist the president’s agenda.

CNN’s Jennifer Agiesta contributed to this report.