Read all of the statement here at the CPSC [although for the original letter, the link below loads faster than the CPSC link]. Here is an excerpt:

This week, several members of Congress publicly called for my resignation as CPSC Acting Chairman, citing a letter I recently sent to the Senate Commerce Committee expressing my views on pending legislation before that committee. In the letter (pdf), I respectfully pointed out what I think are several unwise proposals in a bill to reauthorize and expand the mission of the CPSC. However, despite media reports to the contrary, nowhere in the letter (or anywhere else) did I assert that the CPSC does not need additional resources. In fact, quite to the contrary, the main message of the letter is that if CPSC resources are diverted to new missions and mandates, we will need a dramatic upsurge in our personnel and funding, far beyond what either the House or Senate are proposing for our pending budget.