Rubio has formed a conservative coalition in the Senate with Sens. Mike LeeMichael (Mike) Shumway LeeRubio on push for paid family leave: ‘We still have to work on members of my own party’ National ad campaign pushes Congress to pass legislation lowering drug prices Senate Republicans call on Trump to preserve NAFTA MORE (R-Utah), Ted CruzRafael (Ted) Edward CruzSasse statement: Trump nominee who spread conspiracy theories has a ‘tinfoil hat’ Coalition of 44 groups calls for passage of drug pricing bill For the sake of our democracy, politicians must stop bickering MORE (R-Texas) and Rand PaulRandal (Rand) Howard PaulPentagon: War in Afghanistan will cost billion in 2018 Overnight Finance: Senators near two-year budget deal | Trump would 'love to see a shutdown' over immigration | Dow closes nearly 600 points higher after volatile day | Trade deficit at highest level since 2008 | Pawlenty leaving Wall Street group Rand Paul calls for punishment if Congress can't reach a long-term budget deal MORE (R-Ky.) to oppose any short-term spending bill that includes funds for the healthcare law.

Congress will likely need to pass a spending resolution shortly after lawmakers return from the month-long August recess to prevent the government from shutting down.

Rubio said Republicans shouldn't support any funding measure that includes money to implement the healthcare law, including the new insurance exchanges set to launch on Oct 1.

“If this issue isn’t important enough for us to draw a line in the sand on, what issue is?” Rubio said.

Rubio said one of the reasons he opposes the implementation of ObamaCare is because is it “deeply hurtful to small businesses.”

“The impact this is going to have is not only will people lose their healthcare coverage, they're going to lose their hours,” Rubio said. “This is the real-world impact ObamaCare is having. This is terrible for our country."

The Obama administration has delayed for a year the employer mandate in the healthcare law, which requires businesses with more than 50 full-time employees to provide health insurance.

Republicans say the mandate will cause businesses to lay off workers and reduce hours in order to escape the requirements.