According to snopes.com this isn't true.
No the movie Holiday Inn was made before White Christmas. The movie Holiday Inn debuted the song White Christmas and the Movie White Christmas was made to promote and build on the popularity of the song.
The White House has an official indoor Christmas tree called White House Christmas Tree or Blue Room Christmas Tree. The first official indoor Christmas tree was installed on 19th century.
'Holiday Inn' in 1942 and again in 'White Christmas' from 1954.
The song "White Christmas" first appeared in the movie Holiday Inn.
White Christmas.
Christmas at the White House was created in 1972.
This is a statement not a question. If you are asking about Christmas at the White House the web site that the White House has shows the rooms at Christmas.
Holiday Inn
White Christmas.
John Adams did celebrate Christmas in the White House. He, along with his wife, hosted the very first White House Christmas party.
'Holiday Inn ' in 1942 .
Holiday Inn