President Barack Obama is threatening Senate Democrats that if they approve a continuing resolution to fund the government past Monday that also delays Obamacare for one year, he will veto that resolution and shut down the government.

That President Obama issued a veto threat against such a CR on Saturday evening—before the Republican-controlled House voted to approve an amended CR that would delay Obamacare–has been widely reported. That this veto threat by its very nature was targeted at Senate Democrats has not been.

Obama’s threat to shut down the government by vetoing a CR that delays Obamacare is aimed at Senate Democrats because the only way a CR of that nature could get to Obama’s desk—where he would have an opportunity to actually veto it—is if enough Senate Democrats agreed to vote for such a CR and send it on to Obama.