No. Under the US/Canadian treaty position, your Social Security income is not taxable in the US but is taxable in Canada if you are a resident of Canada. RRSP income, employment income are also not taxable in the US.
In fact, Article 18 of the US/Canadian Tax Treat states "Pensions and annuities arising in a Contracting State and paid to a resident of the other Contracting State may be taxed in that other State, but the amount of any pension included in income for the purposes of taxation in that other State shall not exceed the amount that would be included in the first-mentioned State if the recipient were a resident thereof".
US/Canadian Tax Treaty
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