US President Joe Biden signs executive orders for economic relief to Covid-hit families and businesses in the State Dining Room of the White House in Washington, DC, on January 22, 2021.Nicholas Kamm | AFP | Getty ImagesPresident Joe Biden will sign a travel ban Monday on most non-U.S. citizens entering the country who were recently in South Africa, where a new strain of Covid-19 has been identified, a person familiar with the situation told CNBC.Biden will also reinstate travel restrictions on the entry of non-U.S. citizens from the U.K. and Brazil, where new Covid strains have emerged. The restrictions …