WASHINGTON (AP) — The whistleblower who raised alarms about President Donald Trump’s dealings with Ukraine and touched off the Democratic-led impeachment inquiry is willing to answer written questions submitted by House Republicans, the person’s lawyer says.

But President Donald says that’s not good enough.

Trump himself refused to provide anything but written answers in response to limited questions during the special counsel’s investigation into Russian interference during the 2016 election.

The testimony offer, made over the weekend to Rep. Devin Nunes, the top Republican on the Intelligence Committee, followed escalating attacks by Trump and his GOP allies who are demanding the whistleblower’s identity be revealed.

It would allow Republicans to ask questions of the whistleblower without having to go through the committee’s chairman, Democratic Rep. Adam Schiff.

“Being a whistleblower is not a partisan job nor is impeachment an objective. That is not our role,” Mark Zaid, the whistleblower’s attorney, tweeted Sunday.

“We will ensure timely answers,” he said.

U.S. whistleblower laws exist to protect the identity and careers of people who bring forward accusations of wrongdoing by government officials. Lawmakers in both parties have historically backed those protections.

But Trump, weighing in on Twitter Monday morning, said the person should appear publicly.

“He must be brought forward to testify. Written answers not acceptable!” Trump wrote, slamming the entire process as a “Con!”

Trump has denied he did anything wrong in his July 25 phone call with Ukrainian President Volodymyr Zelenskiy, in which he pressed Zelenskiy to investigate Trump’s political rivals. At the time, the administration was withholding military aid to Ukraine that had been approved by Congress.