The US vice president Mike Pence was caught on camera saying Donald Trump was "unstoppable", during a conversation with Israeli prime minister Benjamin Netanyahu at the World Holocaust Forum in Jerusalem.

Mr Pence said: "We're contending. He's unstoppable, like somebody else I know."

His comments followed another day of the president's impeachment trial in the Senate, and ahead of another hours-long round of damning remarks from the prosecution linking Mr Trump to abuses of power and obstruction of Congress in its investigation of the president putting pressure on Ukraine to find politically damaging information on his 2020 rival Joe Biden.

Meanwhile, Mr Netanyahu faces three indictments of his own ahead of Israel's third national election within a year.

The two men were among a host of world leaders attending a memorial recognising the 75th anniversary of the liberation of the Auschwitz-Birkenau death camps in Nazi-occupied Poland.

Israel election 2019: Netanyahu battles to hang on to power Show all 20 1 /20 Israel election 2019: Netanyahu battles to hang on to power Israel election 2019: Netanyahu battles to hang on to power An Israeli man holding his dog casts his ballot EPA Israel election 2019: Netanyahu battles to hang on to power Chief Rabbi of the Vizhnitz (Hasidic Dynasty) Israel Hager (left), casts his ballot AFP/Getty Israel election 2019: Netanyahu battles to hang on to power Israeli Prime Minister Benjamin Netanyahu and his wife Sara casts their votes AFP/Getty Israel election 2019: Netanyahu battles to hang on to power A man takes a selfie with his mobile phone as he casts his ballot Reuters Israel election 2019: Netanyahu battles to hang on to power An Arab Israeli woman votes during Israel's parliamentary election at a polling station in Kafr Manda near Haifa on September 17, 2019. (Photo by Ahmad GHARABLI / AFP)AHMAD GHARABLI/AFP/Getty Images AHMAD GHARABLI AFP/Getty Israel election 2019: Netanyahu battles to hang on to power Israel's former defence minister Avigdor Lieberman and his wife Ella cast their ballots AFP/Getty Israel election 2019: Netanyahu battles to hang on to power Israeli children accompany their father during Israel's parliamentary election at a polling station AFP/Getty Israel election 2019: Netanyahu battles to hang on to power Blue and White party leader Benny Gantz and his wife Revital vote AP Israel election 2019: Netanyahu battles to hang on to power Israeli Prime Minister Benjamin prepares to vote AP Israel election 2019: Netanyahu battles to hang on to power A family votes in the settlement of Tekoa AP Israel election 2019: Netanyahu battles to hang on to power Ballots lies on a table AFP/Getty Israel election 2019: Netanyahu battles to hang on to power Israel's former justice minister Ayelet greets supporters after casting her ballot AFP/Getty Israel election 2019: Netanyahu battles to hang on to power An elderly ultra-Orthodox Jewish man casts his ballot at a voting station in the city of Bnei Brak during the Israeli parliamentary election on September 17, 2019. (Photo by Menahem KAHANA / AFP)MENAHEM KAHANA/AFP/Getty Images MENAHEM KAHANA AFP/Getty Israel election 2019: Netanyahu battles to hang on to power A mother takes a photograph of her daughter near a ballot box Reuters Israel election 2019: Netanyahu battles to hang on to power Children stand with their relative as they place his vote in a ballot box Reuters Israel election 2019: Netanyahu battles to hang on to power A woman holds her dog's leash as she prepares to vote Reuters Israel election 2019: Netanyahu battles to hang on to power An ultra Orthodox Jewish man casts his ballot during Israel's parliamentary election, at a polling station in Rosh Haayin, on September 17, 2019. (Photo by Jack GUEZ / AFP)JACK GUEZ/AFP/Getty Images JACK GUEZ AFP/Getty Israel election 2019: Netanyahu battles to hang on to power An Israeli woman casts her ballot during Israel's parliamentary election at a polling station in Tel Aviv on September 17, 2019. (Photo by GIL COHEN-MAGEN / AFP)GIL COHEN-MAGEN/AFP/Getty Images GIL COHEN-MAGEN AFP/Getty Israel election 2019: Netanyahu battles to hang on to power Israel's head of the Joint List alliance Ayman Odeh casts his ballot accompanied by his family AFP/Getty Israel election 2019: Netanyahu battles to hang on to power epa07847854 Ultra-Orthodox Jews register at polling station during the Israeli legislative elections, in Jerusalem, Israel, 17 September 2019. Israelis are heading to the polls for a second general election, following the prior elections in April 2019, to elect the 120 members of the 22nd Knesset, or parliament. According to the Israel Central Bureau of Statistics, about six million people are eligible to vote. EPA/ABIR SULTAN ABIR SULTAN EPA

Mr Pence's meeting with Mr Netanyahu preceded an announcement that the White House will host the prime minister and his political rival, Benny Gantz, to begin negotiations under the president's proposed "peace" deal, orchestrated by his son-in-law Jared Kushner.

The vice president said the meeting will "continue discussions about a broad range of issues of mutual concern between the United States and Israel, but also about the prospect of peace."

Mr Netanyahu said he plans to discuss with Mr Trump "his ideas on how to advance peace, and to work closely with him to advance that goal".

The plan effectively ignores Palestinians, who have remained outside of negotiations as the US continues its support for the Israeli government. Mr Gantz is Mr Netanyahu's political foe, and has suggested making territorial concessions to the Palestinians, but has not committed to recognising statehood.