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It is a significant show of solidarity by Joe Biden - his midweek trip to Israel elevates his presence in this conflict and his position of support and deterrence.

A US president travelling in wartime towards this particular theatre of war wasn't a decision taken lightly, given the security concerns.

The will of Biden himself won the day - he wants the visit as a clear manifestation of America's commitment to the Israeli cause.

Israel-Gaza latest: Biden visit will show 'solidarity' with Israel

His priorities, say officials, are hostages (which include a number of Americans) and a humanitarian corridor that would allow aid to enter Gaza and people to leave.

And then there's deterrence - taking a message into the neighbourhood, hand-delivered, that America won't tolerate a widening of the conflict.

But none of this is straightforward. The unpredictability of what happens next haunts all concerned - for Joe Biden, it carries serious political jeopardy.

He has welded himself to Israel's intent in terms of hitting back against Hamas, while stressing the humanitarian imperative.

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The question is how compatible those things are and, as this conflict evolves, it is an issue that will become more acute.

There will be an impact on public opinion if and when innocent casualties of an Israeli land assault in Gaza start appearing on our screens.

Biden sees the risk and, in taking part-ownership of what comes next, he will want assurances of measure and control from Israeli Prime Minister Benjamin Netanyahu when they talk warfare.

It is the showpiece of an intense diplomatic effort that will test America's authority and influence in the Middle East.

Once again, it seeks to shape events in a region where events tend to shape themselves.

Time will be the test of many things in this conflict - how it shapes a defining issue of the Biden presidency is but one.