Former US national security adviser Robert O'Brien has been subpoenaed by special counsel Jack Smith in his probes into classified documents found at former President Donald Trump's Mar-a-Lago residence and efforts to overturn the results of the 2020 election, CNN reported on Thursday, citing a source.
US Attorney General Merrick Garland named Smith as special counsel in November to oversee investigations of Trump, shortly after Trump said he would seek the Republican nomination for president again in 2024.