US President Donald Trump has resumed making calls and tweeting from hospital, but doctors say his progress on Sunday will be crucial to see if he develops a more severe form of Covid-19.

The president’s medical team was due to give an update of the his condition late Sunday morning.

Trump posted a video Saturday from the business suite in Walter Reed medical center near Washington, saying he was improving and would be “back soon” — but that the crucial coming days would be “the real test.”

On Sunday, his deputy campaign manager Jason Miller told ABC he had spoken to Trump for a half-hour Saturday and that the president was eager for political news with the November 3 election less than a month away.

This White House handout photo released October 4, 2020 shows US President Donald Trump working in his conference room at Walter Reed National Military Medical