*Ilhan Omar and Rashida Tlaib denied entry for 'backing pro-Palestinian movement to boycott Israel'

Israel said on Thursday it will bar a planned visit by two US congresswomen who have supported a boycott of the country over its treatment of the Palestinians, a decision strongly encouraged by President Donald Trump.

Prime Minister Benjamin Netanyahu called the highly unusual move against Ilhan Omar and Rashida Tlaib necessary, charging that their "sole purpose is to harm Israel and increase incitement against it".

US politicians called on Israel to reconsider, while senior Palestinian official Hanan Ashrawi labelled it "an outrageous act of hostility against the American people and their representatives".

Omar said it was a "chilling" decision and an "insult to democratic values."

Omar and Tlaib, who is of Palestinian origin, were expected to arrive in Israel at the weekend for a visit that would have taken them to the Palestinian territories.

Israeli officials said they would consider a separate humanitarian request from Tlaib to visit family members in the occupied West Bank, a trip for which she would have to pass through Israel.

Israel announced its decision shortly after Trump called on the country to bar the Democratic congresswomen who are among his sharpest critics.

"It would show great weakness if Israel allowed Rep. Omar and Rep. Tlaib to visit," Trump wrote on Twitter.

He continued with typical bombast: "They hate Israel & all Jewish people, & there is nothing that can be said or done to change their minds. Minnesota and Michigan will have a hard time putting them back in office. They are a disgrace!"

Tlaib is from Michigan and Omar from Minnesota.

Netanyahu alleged the itinerary of the congresswomen showed they intended to strengthen the boycott movement against Israel.

"As a vibrant and free democracy, Israel is open to any critic and criticism, with one exception," Netanyahu said.

"Israel's law prohibits the entry of people who call and act to boycott Israel, as is the case with other democracies that prevent the entry of people whom they see as harming the country."

In 2017, Israel passed a law banning entry to foreigners who support boycotting the country.

The law was passed in response to a movement to boycott Israel.

Israel sees the movement as a strategic threat and accuses it of anti-Semitism -- a claim activists deny.

Both Omar and Tlaib have been critical of Israel's occupation of the West Bank and treatment of Palestinians.

The Democrats have also faced accusations of anti-Semitism, which they firmly deny.

Israel's ambassador to the US, Ron Dermer, had previously signalled the two would be allowed to visit out of respect for Washington, Israel's most important ally.

But the two are also outspoken critics of Trump, who has a close relationship with Netanyahu.

Known as "the squad," the congresswomen -- along with two other progressive congressional allies, Alexandria Ocasio-Cortez and Ayanna Pressley -- have been in Trump's crosshairs.

He has taken aim at all four in a series of xenophobic comments, telling them to "go back" where they came from and accusing them of "love" for America's "enemies like Al-Qaeda".

Tlaib and Omar, who fled war-torn Somalia as a child and arrived in the US as a refugee, are the first two Muslim women elected to Congress.

Tlaib is also the first woman of Palestinian descent in Congress.

Ahead of Israel's announcement, prominent Democratic presidential candidate Elizabeth Warren tweeted that barring the two women "would be a shameful, unprecedented move".

Republican Marco Rubio said he disagreed with it since "being blocked is what they really hoped for all along".

Members of Congress are regular visitors to Israel and the Palestinian territories and blocking them is highly unusual.

It comes at a time when Jewish groups in the US have expressed concern over whether bipartisan support for Israel in Washington is eroding.

Democratic candidates for president in the US have openly criticised Netanyahu, who is seeking re-election in Israel on September 17 after polls earlier this year failed to yield a coalition.

Influential US pro-Israel lobby AIPAC said it disagreed with the views of the congresswomen, but opposed the decision to bar them.

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