JERUSALEM (AP) — Republican Sen. John McCain says Israeli Prime Minister Benjamin Netanyahu has “serious, serious concerns” about parts of the proposal Secretary of State John Kerry is using to broker peace with the Palestinians.

McCain spoke Friday in Jerusalem where Kerry is making his tenth visit to craft a peace accord.

Kerry met a second time in two days with Netanyahu and planned to travel to Ramallah later on Friday to meet with Palestinian President Mahmoud Abbas.

McCain says he shares Netanyahu’s concerns about whether some parts of the plan being discussed are enforceable, viable options that do not jeopardize Israel’s security.

McCain was in Israel with fellow Republican Sens. John Barrasso of Wyoming and Lindsey Graham of South Carolina, following a visit to Afghanistan.

Copyright 2014 The Associated Press.