Prime Minister Benjamin Netanyahu said Monday that Israel was facing “complex and challenging days” as tensions escalate between the United States and Iran following President Donald Trump’s threat of strikes should Tehran refuse to accept a new nuclear agreement.“We are in very complex and challenging days,” Netanyahu told lawmakers in a brief address to parliament. “We are keeping our eyes open and are prepared for any scenario.”For all the latest headlines follow our Google News channel online or via the app.He also reiterated a warning to Iran’s leadership: “I have conveyed to the ayatollah regime that if they make the gravest mistake in their history and attack the State of Israel, we will respond with a force they cannot even imagine.”The premier further highlighted Israel’s close military cooperation with the US, as Washington continues to build up its military presence near Iran and in the Middle East. “The alliance with the United States has never been closer,” Netanyahu