The EU's top diplomat, Josep Borrell, urged Israel on Tuesday not to annex the Jordan Valley, warning of violent Palestinian protests if it went ahead.
"This may happen ... You can be sure it's not going to be peaceful," Borrell told the European Parliament.
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Prime Minister Benjamin Netanyahu toured the Jordan Valley on Monday and reiterated his pledge to apply Israeli law there and in other areas that have been designated under the newly unveiled White House peace plan.
"President Donald Trump said that he will recognize Israel's application of sovereignty [over the relevant areas], and he will do so once we finalize the processes that have already begun," Netanyahu said,
Borrell, who traveled to Washington last week, also reiterated his rejection of parts of Trump's peace plan.
"The proposals tabled two weeks ago clearly challenge the internationally agreed parameters. It is difficult to see how this initiative can bring both parties back to the table," Borrell said of Israel and the Palestinians.
"I made this point to my (US) interlocutors: We need to ask ourselves whether this plan provides a basis for progress or not."