Two people have been killed and two others are missing after a fire started on an oil rig in the Gulf of Mexico.
Four other individuals have been air-lifted to hospital.
The rig off the coast of Venice in Louisiana is owned by Black Elk Oil, a Houston-based energy company.
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A top temperature today of 13 Celsius (55F).
Mr Trump tweeted that Mr McMaster has done "an outstanding job & will always remain my friend." He said MrBolton will take over on April 9.
The committee wants a more stringent interpretation of air quality laws and for noise estimates to reflect a range of possible flight paths.