As two of his key nominees withdrew from his administration because of tax wrongdoings and questions are being raised about several other appointees for not meeting the standards set by him, the US President Barack Obama admitted that he has committed mistakes.

"I think I screwed up. I take responsibility for it and we're going to make sure we fix it so it doesn't happen again," Obama said in an interview.

In a setback to his two-week old administration, Tom Dashes and Nancy Killefer, withdrew from their nominated posts of Secretary of Health and Human Services and White House's Chief Performance Officer respectively. Both were facing tax related issues primarily having failed to paid their taxes.

In a series of interviews to US electronic media, Obama took the responsibilities of the mistake that his team has made in vetting individuals on whom questions are being raised.

"What became clear to me is that we can't send a message to the American people that we've got two sets of rules: one for prominent people and one for ordinary people. So I consider this a mistake on my part and one that I intend to fix and correct and make sure that we're not screwing up again," the President told in another interview.

The series of interviews to five major US television networks, which were primarily meant to drum up support for his economic stimulus package, ended up in Obama responding to questions related to the first controversies of his administration.