The U.S. military-industrial complex in general, led by the neocons, manufactured pretexts for attacking Iraq. They've been trying to do exactly the same thing against Iran. They started with the same WMD charges. However, Iran has been rather transparent through the U.N. and they have stood on their religious tenet of not deliberately or knowingly lying, which makes many of them reachable by real Christianity for giving and sharing all for all, pacifism, and sexual propriety (harmlessness).
The lies that the neocons told about Iraq are negatively resonating with a huge number of Americans. Those Americans are not accepting the unsubstantiated claims of the neocons that Iran is striving for nuclear weapons.
The Neocons, knowing this, are leveling charges against Iran concerning all manner of things. They have been constantly stating that Iran is arming insurgents in Iraq, something the U.S. government is doing (arming insurgents) as official policy for the sake of causing division (chaos) out of which shock they, the imperialists, imagine they will herd a dazed and confused people just as they herded the American people via the false-flag operation known as 9/11.
The Iranians cannot prove that they are not supplying arms to Iraqis. It is not their burden. The burden of proof falls on the accuser. No proof has been given. In addition, the so-called enforcers (U.S. military and intelligence) are proven perjurers whose testimony is impeached before they even give it. They have cried wolf endless times. They have always turned out to be liars, not just three times in a row but always. Lying is their stock and trade. Everyone who follows them after this fact has been exposed is one of them: A liar.
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it. John 8:44.
Yet ye have not known him; but I know him: and if I should say, I know him not, I shall be a liar like unto you: but I know him, and keep his saying. John 8:55.