White House press secretary Jay Carney called the Republican-issued subpoena of Chief Technology Officer Todd Park an “unnecessary step,” declining to say whether the central figure in the construction of healthcare.gov would testify before lawmakers on Wednesday.

Rep. Darrell Issa, R-Calif., chairman of the House Oversight and Government Reform committee, has demanded that Park discuss the botched rollout of the federal health care website with lawmakers during a hearing Wednesday.

Just a day away from the House Oversight hearing, Carney said it was “not a matter of if, but when” Park would testify. Obama’s top spokesman said the administration would respond to the request but did not telegraph whether it would be honored.

Before taking his current job, Park was tasked with developing the Obamacare website for the Department of Health and Human Services. Even in his new post, his biggest job is now fixing that same website.

Issa contends that Park should testify so the American public can get a better sense of what went wrong with the website.

"You are the only invited witness who remains unwilling to appear voluntarily … I am left with no choice but to compel your appearance," Issa wrote, issuing Park the subpoena.

The White House counters that Park is too busy trying to repair healthcare.gov to meet with lawmakers — at least for now.