Police in Las Vegas said someone broke in to the office of Nevada Senator Dean Heller on Sunday

Police in Las Vegas said someone broke in to the office of the state's Republican senator, Dean Heller, on Sunday.

Authorities announced that they were investigating the matter.

A spokesperson for Heller told Fox 5 that they could not comment due to the ongoing investigation.

Heller has been the focus of a fierce political tug-of-war in recent weeks over his indecision on the GOP's efforts to repeal Obamacare.

The Republican senator is up for re-election next year in a state that Hillary Clinton won over President Donald Trump.

If Heller supports the GOP plan and thousands of his constituents end up losing their health insurance as a result, he could be vulnerable to an election loss come November 2018.

There are already two GOP senators opposed to the legislation, so one more 'no' vote would kill the bill outright in a Senate divided 52-48 between Republicans and Democrats.

Authorities announced that they were investigating the matter. A spokesperson for Heller told Fox 5 that they could not comment due to the ongoing investigation. Heller's office in Las Vegas is seen in the above file photo

If he opposes the GOP bill and helps kill it, he would then face backlash from the pro-Trump rightist flank of his party.

Health care legislation is hanging by a thread in the Senate, and no one is under more pressure than Heller.

Even before the health care debate, Heller was already seen as the most endangered GOP incumbent senator in next year's midterm elections.

He is the only one running for re-election in a state Trump lost.

Over the next several days Heller must decide whether to defy Trump and Senate Majority Leader Mitch McConnell by becoming that third 'no.'

Yet if he sides with the president and Senate leader and supports the bill, Heller would likely be parting ways with Nevada's popular GOP Governor Brian Sandoval, who has already expressed deep concerns about the legislation's cuts to the Medicaid program for the poor and disabled.

For Heller, it looks like a no-win situation.

'There is no sweet spot in health care,' said Heller's fellow Nevada Republican Rep. Mark Amodei.

'So if somebody's looking for it, they're going to be a pretty frustrated person.'

Over the next several days Heller must decide whether to defy Trump and Senate Majority Leader Mitch McConnell by becoming the third 'no' vote that would sink the GOP's repeal of Obamacare

The normally affable and low-key Heller had no announced public events Friday, and a spokeswoman did not respond to requests for comment.

On Thursday Heller released a terse statement saying that 'Conversations are continuing and I'm going to read the new bill and weigh its impact on Nevada.'

Heller, 57, took Senate GOP leaders by surprise with his outspoken opposition to an earlier version of the bill last month.

He appeared at a press conference with Sandoval where both denounced the bill crafted largely in secret by McConnell.

'I cannot support a piece of legislation that takes insurance away from tens of millions of Americans,' Heller said at the time.

McConnell was forced to withdraw the bill in face of certain defeat.

But the new version he unveiled Thursday also unravels the Medicaid expansion under former President Barack Obama's Affordable Care Act, which has allowed more than 200,000 of the poorest and most vulnerable Nevadans to gain coverage.

Sandoval, who made the decision to accept the Medicaid expansion, expressed serious reservations Friday about the latest version of the bill, though without expressing outright opposition.

'My concern all along has been with the expansion population, the newly eligibles. There are approximately 210,000 of those in Nevada who are having a dramatically better quality of life and are living healthier and happier, and I just, those are the lives I want to protect,' Sandoval told reporters at a conference of governors in Providence, Rhode Island.

If Heller sides with the president and Senate leader and supports the bill, Heller would likely be parting ways with Nevada's popular GOP Governor Brian Sandoval (left), who has already expressed deep concerns about the legislation's cuts to the Medicaid program for the poor

Sandoval, who appointed Heller to the Senate in 2011 after a scandal forced his predecessor to resign, said he planned to talk with the senator later in the day.

'I'm doing my job and he's doing his job,' Sandoval said.

'It's a new bill. It's less than 24 hours old. He has said he's going to spend the weekend reading it, and so I hope I can better inform him with regard to its impacts on Nevada.'

After Heller announced his opposition to the initial bill in June, a group linked to Trump launched a hard-hitting ad campaign against him.

From the other side Democratic groups have already signaled they will use the issue against him in his re-election campaign, a fate Heller probably can't escape no matter how he votes.

And Heller's predicament is all the more notable in that it was a fellow Nevadan, former Senate Democratic Leader Harry Reid, who pushed Obamacare to passage in 2010, including by securing the votes of some very vulnerable Democratic senators who subsequently lost their seats over the issue.

One of those lawmakers, former Democratic Senator Mary Landrieu of Louisiana, expressed little sympathy this week for the Republicans who now find themselves in a position similar to the one that ultimately ended her political career.

Noting that Trump had promised better health insurance for all, Landrieu said: 'They have not put a bill together that meets their own promise, and that is their problem. And I'm not sure how they can fix that right now.'