Hillary Clinton went on a Twitter tirade Wednesday against Donald Trump, asking the billionaire 20 questions about reported conflicts of interest that he may have if elected.

The Democratic presidential nominee was referencing a Newsweek cover story arguing that the Trump Organization’s international business relationships could make it hard for a President Trump to conduct foreign policy.

In a post on her website, Clinton said that Trump’s career was “full of sketchy relationships with foreign countries.”

The posts comes amid a debate over Trump’s tax returns, which he has declined to make public, citing a pending IRS audit as prohibiting him from releasing his taxes.

In her tweets, Clinton questioned what Trump would make a priority—America or his personal investments.

1. Will you sever ties with your company linked to foreign leaders, questionable organizations, and criminals if you become president?

— Hillary Clinton (@HillaryClinton) September 14, 2016

3. While refusing to release your tax returns, how will you confirm that you do not have dangerous financial ties to bad actors abroad?

— Hillary Clinton (@HillaryClinton) September 14, 2016

5. How can you be tough on Iran, given your business partnership with someone connected to Iranian money laundering? pic.twitter.com/1AdDm2kfvy

— Hillary Clinton (@HillaryClinton) September 14, 2016

7. To what extent would your foreign policy be dictated by potential financial benefits for your business partners? pic.twitter.com/4Nd9KSdTfi

— Hillary Clinton (@HillaryClinton) September 14, 2016

9. Have you or your campaign discussed U.S.-Russian relations with the Russian billionaires with whom you've done business?

— Hillary Clinton (@HillaryClinton) September 14, 2016

11. With business ties to politically-connected Indian developers, how can you conduct foreign policy that puts the U.S. above your profits?

— Hillary Clinton (@HillaryClinton) September 14, 2016

13. How can we know you won't (again) impulsively damage relationships with crucial allies to preserve your own ego? https://t.co/j1VtaFhA6C

— Hillary Clinton (@HillaryClinton) September 14, 2016

15. To what extent are you and your family currently contractually tied to payments from foreign business partners, or governments?

— Hillary Clinton (@HillaryClinton) September 14, 2016

17. Will your children disclose all of the foreign trips and business deals they've undertaken during the campaign, and with whom they met?

— Hillary Clinton (@HillaryClinton) September 14, 2016

19. In sum, how will Trump guarantee that if forced to choose between America's security and his own bank account, he won't pick the latter?

— Hillary Clinton (@HillaryClinton) September 14, 2016

20. It's pretty clear: Trump's spent his life unscrupulously looking out for his own wallet above all. Why would that change as president?

— Hillary Clinton (@HillaryClinton) September 14, 2016