Theresa May has been urged to broaden the scope of the inquiry into historic child sex abuse from its current remit of just England and Wales.
The Home Affairs Select Committee argues it should be widened to include Scotland and Northern Ireland, to take into account claims of abuse at Kincora Boys' Home in Belfast in the 1970s.
The home secretary also came under fire for not revealing the salary of the new head of the inquiry.
New Zealand High Court judge Justice Lowell Goddard was appointed to the post last week, but the Home Affairs Select Committee said it was “disappointed” details of her pay would not be disclosed.
"This is not in line with the open and transparent approach we would expect in the course of a pre-appointment process," the committee said.