US President Donald Trump has announced plans for the federal government to purchase $200 billion worth of mortgage bonds, saying the move will help bring down mortgage rates as concerns over housing affordability continue to weigh down Americans. In a post on social media on Thursday. Trump said the funds would come from Fannie Mae and Freddie Mac, the two mortgage giants that have been under government conservatorship since the 2008 financial crisis. According to the US president, companies currently hold $200 billion in cash that will be used for the bond purchases.