Why do you think Obama has not fulfilled his duty according to the Oil Pollution Act of 1990?

(A) If a discharge, or a substantial threat of a discharge, of oil or a hazardous substance from a vessel, offshore facility, or onshore facility is of such a size or character as to be a substantial threat to the public health or welfare of the United States (including but not limited to fish, shellfish, wildlife, other natural resources, and the public and private beaches and shorelines of the United States), the President shall direct all Federal, State, and private actions to remove the discharge or to mitigate or prevent the threat of the discharge.
(B) In carrying out this paragraph, the President may, without regard to any other provision of law governing contracting procedures or employment of personnel by the Federal Government:
(i) remove or arrange for the removal of the discharge, or mitigate or prevent the substantial threat of the discharge; and
(ii) remove and, if necessary, destroy a vessel discharging, or threatening to discharge, by whatever means are available.

The Oil Pollution Act of 1990 makes clear that it is the President's responsibility to protect the US coastline and wetlands in the case of an oil spill. So why hasn't he done it?