No knowledge of Trump ordering Assad killed: Israeli minister

"I do not know of any such instruction. He (Trump) is also denying it, by the way," Israeli Intelligence Minister Israel Katz told Tel Aviv radio station 103 FM.

"In any event, what can be said is that in the framework of the coordination between the United States and Israel the subject of the Syrian regime is certainly part of the discussions. Israel did not take a decision to topple Assad."

While formally neutral on the 7-year civil war in neighbouring Syria, Israel has carried out scores of air strikes against suspected attempts by Assad's Iranian and Lebanese Hezbollah allies to set up permanent posts or advanced arms.

Under decades of Assad family rule, Syria has maintained a Cold War-style hostility toward Israel. Katz said Israel did not see a better alternative to Assad among Syrian rebel groups.

"Of course his (Assad's) actions are terrible actions, and something that we abhor and condemn. Those opposing him, ISIS and others, are not a side that we think are better. We took care to preserve our interests," Katz said.

Woodward gained national fame for his reporting on the Watergate scandal in the 1970s, and has since written a number of books that provide behind-the-scenes glimpses of presidential administrations and other Washington institutions.

For this book, Woodward spoke to top aides and other insiders with the understanding that he would not reveal how he got his information, said the Washington Post, which published excerpts from the book on Tuesday.