Two more DeSantis events postponed amid Iowa storm; Trump weather could dent caucus turnout – as it happened

This live blog is now closed. For more on Iowa, you can read:

• What are the Iowa caucuses and how will they shape the 2024 US election?
• Final days of Iowa campaigning snarled by life-threatening' winter weather

Hunter Biden's attorney says the president's son will testify to House Republicans investigating his overseas business dealings, if new subpoenas are issued.

The letter from the attorney Abbe Lowell to the Republican House judiciary committee chair, Jim Jordan, and the oversight committee chair, James Comer, argues that previous subpoenas from the committees to the president's sone were invalid, because the House had not formally voted to authorize an impeachment inquiry against Joe Biden. That inquiry, which the House voted to approve last month, centers on unproven allegations that the president profited illicitly from his son's businesses abroad.