Image copyright Getty Images Democrats have asked President Donald Trump to postpone a speech to Congress, arguing security cannot be guaranteed due to the government shutdown. Speaker of the House Nancy Pelosi said in a letter to Mr Trump that he should deliver the speech in writing instead unless federal agencies reopen. Mr Trump is due to address Congress for the annual State of the Union speech on 29 January. The US government is partially shut due to a row over border security. The Republican president is demanding $5.7bn (£4.4bn) of congressional funding to build a wall on the US-Mexico border, but newly empowered Democrats have refused. ‘I can’t get my meds’ The impact of the government shutdown The White House response came from Homeland Security Secretary Kirstjen Nielsen, who tweeted that her department and the US Secret Service “are fully prepared to support and secure the State of the Union”. Skip Twitter post by @SecNielsen The Department of Homeland Security and the US Secret Service are fully prepared to support and secure the State of the Union. We thank the Service for their mission focus and dedication and for all they do each day to secure our homeland. — …