White House Reviews Roberts’ Tax Returns, Won’t Commit To Sharing With Senate

Yesterday, the White House said that the tax returns of Supreme Court nominee John Roberts were off limits:

The White House said [yesterday] that under a policy enacted in 2001 it would neither examine Roberts’s tax returns itself nor provide them to the Senate.

But at today’s press briefing, Scott McClellan admitted the White House has reviewed Robert’s tax returns as part of their vetting process:

Now, in terms of Judge Roberts, and as part of the vetting process, we did ask for his tax returns from the past three years, and we have received those.

But McClellan still won’t commit to providing the documents to the Senate. Question: If the tax returns are relevant to the White House’s vetting process, why aren’t they relevant to the Senate’s process?