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HIGHLIGHTS-The Trump presidency on Feb 26 at 4:36 p.m. EST/2136 GMT

Feb 26 (Reuters) - Highlights of the day for U.S. President Donald Trump's administration on Sunday: BUDGET Trump's first budget proposal will spare big social welfare programs such as Social Security and Medicare from any cuts, Treasury Secretary Steven Mnuchin says in an interview.

INVESTIGATIONS The White House does not rule out that Attorney General Jeff Sessions may recuse himself from Justice Department investigations into allegations of Russian interference in the 2016 presidential election.

REGULATIONS U.S. Transportation Secretary Elaine Chao says she is reviewing self-driving vehicle guidance issued by the Obama administration and urges companies to explain the benefits of automated vehicles to a skeptical public.

Trump's administration will begin rolling back Obama-era environmental regulations in an "aggressive way" as soon as this week, the head of the Environmental Protection Agency says, adding he understands why some Americans want to see his agency eliminated completely.

MEDIA RELATIONS Trump says he will not attend the annual White House Correspondents' Association dinner, a high-profile event that draws celebrities, politicians and journalists.

(Compiled by Peter Cooney; Editing by Alistair Bell)