After publicly calling for China to open an investigation into Joe and Hunter Biden on the White House lawn on Thursday, Donald Trump said that he had not yet personally asked Xi Jinping to look into the matter.

However, two sources have told CNN that Trump did at least bring up Biden’s political prospects in a call with the Chinese leader on June 18. Further details of that call are unclear except that Trump reportedly pledged to stay silent on the Hong Kong protests while trade negotiations between the two countries progressed.

The White House record of the call has been stored in a highly-secured electronic system used to house other calls that Trump has made with foreign leaders, including his now-infamous one with Ukrainian president Volodymyr Zelensky.

Just following Trump’s comments to reporters and just before the CNN story was published, Democratic senator and presidential hopeful Kamala Harris called for the White House to release the records of Trump’s phone calls with Xi.

We need to know who else Donald Trump has sought favors from. The White House should release records of his calls with the Chinese president. Now. pic.twitter.com/5tjG8k9PHg — Kamala Harris (@KamalaHarris) October 3, 2019

Afterward, Elizabeth Warren, who Trump also reportedly mentioned in his call with Xi, called for the release of the records while accusing Trump of “selling out the people of Hong Kong behind closed doors.”

Trump can say what he wants about me, but it's outrageous that any president would sell out the people of Hong Kong behind closed doors. The public must see the transcript of Trump's call with Xi. And we need a leader who will stand up for our values. — Elizabeth Warren (@ewarren) October 3, 2019

When it comes to the Hong Kong protests, Trump has remained mostly clueless, silent, and deferential towards Beijing, declaring that he hopes the situation will “work out for everybody, including China.” As a way of bringing the demonstrations to an end, he even suggested that Xi meet personally with the protesters.