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US Attorney General Jeff Sessions has denied during a Congress hearing having undisclosed meetings with Russian officials at a Washington DC hotel.
America's top law official also told the Senate Intelligence Committee any suggestion he colluded with the Kremlin was "an appalling and detestable lie".
His remarks come days after sacked FBI boss James Comey said he believed he was fired to change the Russia probe.
Mr Sessions had recused himself from any probe in Russia's alleged meddling.
The Senate panel is one several congressional panels that, along with a special counsel, is also investigating whether any Trump campaign officials colluded with the alleged Kremlin plot.
"I recused myself from any investigation into the campaigns for President, but I did not recuse myself from defending my honour against scurrilous and false allegations," Mr Sessions said in an opening statement on Tuesday.