File handout photo of U.S. President Obama watches as CTO Park shows information on a tablet during a meeting in the Oval Office in WashingtonThrough Roberta Rampton WASHINGTON (Reuters) – A high White House expertise adviser will testify at a congressional hearing on Wednesday concerning the stricken launch of the web page at the heart of President Barack Obama's signature healthcare reform regardless of the administration's assertions that he used to be too busy. The White House tested late on Tuesday that Todd Park, its chief know-how officer, would conform to a subpoena to testify at a hearing of the Republican-controlled House of Representatives Oversight Committee. The White House had asked to extend the listening to until December, pronouncing that Park used to be too busy helping to repair the HealthCare.gov website, which Obama has vowed can be working easily for most people with the aid of the tip of the month.