With all the furor raised by President Trump’s recent suggestion that he might accept renomination at the White House, few have pointed out that he wouldn’t be the first President to make an acceptance speech from his official residence.

That was Franklin D. Roosevelt, who, in accepting the Democrats’ nomination in 1940 for an unprecedented third term, made the speech on national radio from the White House.

FDR actually had two speeches with him — the traditional acceptance speech and a speech declining nomination. He had insisted that the Democratic National Convention nominate his personal choice for vice president — Secretary of Agriculture Henry Wallace — or he would decline the nomination for President.
https://www.newsmax.com/politics/roo.../09/id/981280/