Hillary Clinton's social media team trolled Donald Trump with his own words Friday evening, and launched an online poll suggesting a number of unflattering reasons for why the GOP nominee refuses to release his tax returns.

"Many people are saying Trump won't release his tax returns because he's hiding something. What do you think it is?" the Democratic presidential candidate's Twitter account asked.

The account then included a poll offering social media users four options:

  1. He doesn't pay any taxes
  2. He parks money overseas
  3. He inflates his wealth
  4. He's not very charitable

The tweet's language is also a direct poke at Trump.
On Monday, the GOP candidate was criticized for sending a carefully worded tweet suggesting the unauthorized private email server Clinton used when she served at the State Department may have led to the execution of an Iranian scientist.

"Many people are saying that the Iranians killed the scientist who helped the U.S. because of Hillary Clinton's hacked emails," Trump said.

Clinton's campaign team released her 2015 tax returns Friday morning, and challenged Trump do the same. Democratic vice-presidential nominee Sen. Tim Kaine, D-Va., also released 10 years' worth of tax returns on Friday.

"Hillary Clinton and Tim Kaine continue to set the standard for financial transparency as she releases her 2015 personal tax return and builds on the Clintons' tradition of making their returns public since 1977 and Kaine releases 10 years of his returns," Hillary for America Communications Director Jennifer Palmieri said in a statement Friday.

"In stark contrast, Donald Trump is hiding behind fake excuses and backtracking on his previous promises to release his tax returns. He has failed to provide the public with the most basic financial information disclosed by every major candidate in the last 40 years. What is he trying to hide?" she asked.

Clinton's 2015 tax filings showed she and Bill Clinton paid an effective federal tax rate of 34.2 percent last year.

The same tax documents also showed their adjusted gross income last year was $10.6 million.

Trump refuses to release his tax information, and claims he couldn't do it even if he wanted to because he's supposedly under audit. He has also stated that there is "nothing to learn" from his tax returns.

The GOP candidate's team dismissed Clinton's challenge Friday, and characterized the release of her 2015 filings as a "distraction."