Apple is said to have refused to testify at an upcoming US Senate subcommittee hearing.
Apple is refusing to testify at an upcoming US Senate subcommittee hearing on competition issues related to mobile app stores, the bipartisan leaders of the panel said on Friday.
A subcommittee hearing was being planned for late April but no date has been set yet.
"A little more than two weeks before the planned hearing, Apple abruptly declared that it would not provide any witness," the letter said.
Google has agreed to testify at the subcommittee hearing, a spokeswoman for Klobuchar said.