US President Donald Trump warned on Saturday that a Democratic victory in 2020 could "leave Israel out there", as he highlighted his pro-Israel actions in an effort to make the case for Jewish voters to back his re-election.

Speaking at the annual meeting of the Republican Jewish Coalition, Trump touted his precedent-shredding actions to move the US Embassy to Jerusalem from Tel Aviv and recognition last month of Israeli sovereignty over the disputed Golan Heights, a strategic plateau that Israel seized from Syria in 1967.

"We got you something that you wanted," Trump said of the embassy move, adding: "Unlike other presidents, I keep my promises."

The group, backed by GOP mega donor Sheldon Adelson, supported Trump's 2016 campaign and is preparing to spend millions on his 2020 effort.

"I know that the Republican Jewish Coalition will help lead our party to another historic victory," Trump said. "We need more Republicans. Let's go, so we can win everything."

Support for Israel

Jewish voters in the US have traditionally sided heavily with Democrats - and are often ideologically liberal - but Republicans are hoping to narrow the gap next year, in part as Trump cites actions that he says demonstrate support for Israel.

The Jewish Democratic Council of America on Saturday said American Jews leaving the Democratic Party are a Republican fantasy.

"Trump's presidency has only solidified the fact that the Democratic Party has been - and will remain - the political home of the American Jewish electorate," JDCA Executive Director Halie Soifer said in a statement.

"This is because Trump's policies and rhetoric are antithetical to Jewish values, and because anti-Semitism has increased to unprecedented levels due to Trump's divisive words, policies, and willful blindness."

But at the RJC, Trump earned standing ovations for recounting both the embassy move and the Golan Heights recognition.

Trump noted it had long been a priority for Adelson and his wife, Miriam.

"That is the most important thing that's ever happened in their life," Trump said. "They love Israel."

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